User:Brendlefly62/Rockchip RK3288 Asus Tinker Board S/Build-Install-U-Boot
There are a number of places you can find pre-built images to boot your TInkerBoard S. This guide describes how to set up Das U-Boot bootloader, using another arm device or on an amd64 crossdev platform, by building the bootloader firmware from mainline upstream source code.
Acknowledgement: This article is largely based on a similar work done for the Rock4c+
Shortcut
It really isn't necessary to do all the work outlined in the next section below, if the user has already performed the armbian/build process for producing an Armbian system for this board, as described in the previous section. Part of the output of that process is a debian package containing the u-boot files for the TinkerBoard and a script that explains how to install them --
user $
tree ./armbian-build-output/
|-- debs ... | `-- linux-u-boot-tinkerboard-current_23.11.0-trunk_armhf__2022.04-Se4b6-P0e83-H0e2e-Vc2b8-Bd32f-R448a.deb ...
Extract the contents of the u-bood .deb package
user $
cd armbian-build
user $
dpkg-deb -x ./debs/linux-u-boot-tinkerboard-current_23.11.0-trunk_armhf__2022.04-Se4b6-P0e83-H0e2e-Vc2b8-Bd32f-R448a.deb u-boot
user $
tree u-boot
u-boot/ `-- usr
|-- lib | |-- linux-u-boot-current-tinkerboard | | |-- rk3288_boot.bin | | `-- u-boot-rockchip-with-spl.bin | `-- u-boot | |-- LICENSE | |-- platform_install.sh | `-- tinker-rk3288_defconfig `-- share `-- doc `-- linux-u-boot-tinkerboard-current`-- changelog.gz
Examine (but Do Not execute the "platform_install.sh" script:
user $
cd u-boot
user $
cat usr/lib/u-boot/platform_install.sh
DIR=/usr/lib/linux-u-boot-current-tinkerboardwrite_uboot_platform () {
dd if=/dev/zero of=$2 bs=1k count=1023 seek=1 status=noxfer > /dev/null 2>&1; dd if=$1/u-boot-rockchip-with-spl.bin of=$2 seek=64 conv=notrunc > /dev/null 2>&1}
This script is basically the how-to for putting the secondary program loader (SPL) already built onto a micro SD card that will hold a Gentoo OS and custom kernel.
Use a blank micro SD card, or **Do Not** execute the first dd command in the "platform_install.sh" script - that will erase the partition table and all data on the device will be lost
Only the "with-spl.bin" file is needed for this boardAlso make sure to replace "sdX" below with the right device name
Use the structure of the second "dd" command in that script to write the "with-spl.bin" file to the device
root #
dd if=lib/linux-u-boot-current-tinkerboard/u-boot-rockchip-with-spl.bin of=/dev/sdX seek=64 conv=notrunc > /dev/null 2>&1
The board should now be "bootable" and will display u-boot output on serial console when powered on. See
DIY Prerequisites
The outline below is a work in progress - attempt to document how to build a working u-boot bootloader from scratch. The documentation below is very rough draft and DOES NOT WORK. U-Boot can be built on an ARM device or cross-compiled on a PC. Regardless, we will need:
- git, to check out the sources
- dtc, to compile device trees
- swig, to build U-Boot
- crossdev, since a 32-bit ARM toolchain is required
Let's make sure these are installed:
root #
emerge --ask --update dev-vcs/git sys-apps/dtc dev-lang/swig sys-devel/crossdev
Please review the crossdev article if you don't already have it set up.
You may need to install the 32-bit toolchain, which is required to build code for Cortex-M0 MCUs in BL31:
root #
crossdev --target arm-none-eabi
If cross-compiling, install the 64-bit cross-compiler toolchain:
root #
crossdev --target armv7a-unknown-linux-gnueabihf
Compiling
To compile on ARM run commands like:
user $
make -j$(nproc) PLAT=rk3288 <target>
If cross-compiling, run:
user $
make -j$(nproc) PLAT=rk3288 CROSS_COMPILE=armv7a-unknown-linux-gnueabihf- <target>
If running distcc on the cross-compiling platform, it may be wise/necessary to disable that by temporarily removing '/usr/lib/distcc/bin' from your $PATH and turning off distcc in $FEATURES
user $
export PATH=$(echo $PATH | sed 's|/usr/lib/distcc/bin:||')
user $
MAKEOPTS="-j$(nproc) -l$(nproc)" FEATURES=$FEATURES" -distcc -distcc-pump" PLAT=rk3288 CROSS_COMPILE=armv7a-unknown-linux-gnueabihf- <target>
For Arm64 platforms, there is another pre-requisite step of building Arm Trusted Firmware "bl31" file, but as of Nov. 2023, the ATF Makefile says, "bl31 is not currently supported for aarch32.
Boot Loader alternatives
There are a number of ways to do this. This article describes one way to build a boot loader for TinkerBoard S using Arm Trusted Firmware (ATF or TF-A) and Das U-Boot. For detailed information on other methods, see link in the external resources and references secions, below.
Prepare to Build ATF
user $
git clone https://github.com/ARM-software/arm-trusted-firmware.git
user $
cd arm-trusted-firmware
user $
git tag
... v2.9.0
Select the latest currently stable version:
user $
git checkout v2.9.0
The repository contains a few binaries. If this is unacceptable, they may be deleted:
user $
for x in $(find ./ -iname *.bin); do rm -v $x; done
user $
git status
,,, deleted: plat/arm/board/common/protpk/arm_protpk_rsa_sha256.bin deleted: plat/arm/board/common/rotpk/arm_rotpk_ecdsa_sha256.bin deleted: plat/arm/board/common/rotpk/arm_rotpk_rsa_sha256.bin deleted: plat/arm/board/common/swd_rotpk/arm_swd_rotpk_rsa_sha256.bin deleted: plat/rockchip/rk3368/drivers/ddr/rk3368_ddr_reg_resume_V1.05.bin deleted: plat/rockchip/rk3399/drivers/dp/hdcp.bin ...
Per the ATF "How to Build" instructions,[1] compile (using an appropriately formatted command [see above]) the bl32 file that this board's u-boot will expect. According to the TF-A users guide, using the targets "all fip" will generate all of the bootloader binaries and a firmware information package (fip.bin) --
user $
MAKEOPTS="-j4 -l4" FEATURES=" -userpriv -distcc -distcc-pump" make ARCH=aarch32 PLAT=rk3288 CROSS_COMPILE=armv7a-unknown-linux-gnueabihf- AARCH32_SP=sp_min all fip
Including bl32/sp_min/sp_min.mk CC lib/libfdt/fdt.c CC lib/libfdt/fdt_addresses.c CC lib/libfdt/fdt_empty_tree.c CC lib/libfdt/fdt_ro.c CC lib/libfdt/fdt_rw.c CC lib/libfdt/fdt_strerror.c CC lib/libfdt/fdt_sw.c CC lib/libfdt/fdt_wip.c AR /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/lib/libfdt.a Building rk3288 CC lib/libc/abort.c CC lib/libc/assert.c CC lib/libc/exit.c CC lib/libc/memchr.c CC lib/libc/memcmp.c CC lib/libc/memcpy.c CC lib/libc/memmove.c CC lib/libc/memrchr.c CC lib/libc/memset.c CC lib/libc/printf.c CC lib/libc/putchar.c CC lib/libc/puts.c CC lib/libc/snprintf.c CC lib/libc/strchr.c CC lib/libc/strcmp.c CC lib/libc/strlcat.c CC lib/libc/strlcpy.c CC lib/libc/strlen.c CC lib/libc/strncmp.c CC lib/libc/strnlen.c CC lib/libc/strrchr.c CC lib/libc/strtok.c CC lib/libc/strtoul.c CC lib/libc/strtoll.c CC lib/libc/strtoull.c CC lib/libc/strtol.c AR /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/lib/libc.a CC bl32/sp_min/sp_min_main.c CC common/runtime_svc.c CC drivers/arm/cci/cci.c CC drivers/arm/gic/v2/gicdv2_helpers.c CC drivers/arm/gic/v2/gicv2_helpers.c CC drivers/arm/gic/v2/gicv2_main.c CC drivers/delay_timer/delay_timer.c CC drivers/delay_timer/generic_delay_timer.c CC lib/cpus/errata_report.c CC lib/el3_runtime/aarch32/context_mgmt.c CC lib/el3_runtime/cpu_data_array.c CC lib/locks/bakery/bakery_lock_coherent.c CC lib/psci/psci_common.c CC lib/psci/psci_main.c CC lib/psci/psci_mem_protect.c CC lib/psci/psci_off.c CC lib/psci/psci_on.c CC lib/psci/psci_setup.c CC lib/psci/psci_suspend.c CC lib/psci/psci_system_off.c CC plat/common/aarch32/plat_sp_min_common.c CC plat/common/plat_gicv2.c CC plat/rockchip/common/aarch32/platform_common.c CC plat/rockchip/common/params_setup.c CC plat/rockchip/common/plat_pm.c CC plat/rockchip/common/plat_topology.c CC plat/rockchip/common/rockchip_gicv2.c CC plat/rockchip/common/rockchip_sip_svc.c CC plat/rockchip/common/sp_min_plat_setup.c CC plat/rockchip/rk3288/drivers/pmu/pmu.c CC plat/rockchip/rk3288/drivers/secure/secure.c CC plat/rockchip/rk3288/drivers/soc/soc.c CC plat/rockchip/rk3288/plat_sip_calls.c CC services/std_svc/std_svc_setup.c CC common/bl_common.c CC common/tf_log.c CC drivers/console/multi_console.c CC plat/common/plat_bl_common.c CC plat/common/plat_log_common.c CC plat/common/aarch32/plat_common.c CC lib/compiler-rt/builtins/popcountdi2.c CC lib/compiler-rt/builtins/popcountsi2.c CC lib/compiler-rt/builtins/ctzdi2.c CC lib/compiler-rt/builtins/divdi3.c CC lib/compiler-rt/builtins/divmoddi4.c CC lib/compiler-rt/builtins/lshrdi3.c CC lib/compiler-rt/builtins/udivmoddi4.c CC common/desc_image_load.c CC lib/bl_aux_params/bl_aux_params.c CC plat/common/plat_psci_common.c CC lib/xlat_tables/xlat_tables_common.c CC lib/xlat_tables/aarch32/xlat_tables.c AS bl32/sp_min/aarch32/entrypoint.S AS bl32/sp_min/wa_cve_2017_5715_icache_inv.S AS drivers/ti/uart/aarch32/16550_console.S AS lib/cpus/aarch32/cortex_a12.S AS lib/cpus/aarch32/cpu_helpers.S AS lib/el3_runtime/aarch32/cpu_data.S AS lib/locks/exclusive/aarch32/spinlock.S AS lib/psci/aarch32/psci_helpers.S AS plat/common/aarch32/platform_mp_stack.S AS plat/rockchip/common/aarch32/plat_helpers.S AS plat/rockchip/common/aarch32/pmu_sram_cpus_on.S AS common/aarch32/debug.S AS lib/aarch32/cache_helpers.S AS lib/aarch32/misc_helpers.S AS plat/common/aarch32/platform_helpers.S AS lib/compiler-rt/builtins/arm/aeabi_ldivmod.S AS lib/compiler-rt/builtins/arm/aeabi_uldivmod.S AS lib/compiler-rt/builtins/arm/aeabi_memcpy.S AS lib/compiler-rt/builtins/arm/aeabi_memset.S AS plat/common/aarch32/crash_console_helpers.S PP bl32/sp_min/sp_min.ld.S LD /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/bl32/bl32.elf Built /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/bl32/bl32.elf successfully OD /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/bl32/bl32.dump BIN /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/bl32.bin Built /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/bl32.bin successfully HOSTCC fiptool.c HOSTCC tbbr_config.c HOSTLD fiptool /usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /usr/lib/libc.so when searching for -lc /usr/lib/gcc/x86_64-pc-linux-gnu/13/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /usr/lib/libc.a when searching for -lc Built fiptool successfully Secure Payload BL32 (Trusted OS): offset=0x60, size=0xFF6E0018, cmdline="--tos-fw" Built /home/joe/MyTinkerboardFiles/arm-trusted-firmware/build/rk3288/release/fip.bin successfully
Locate the resulting bl32.elf --
user $
find ./ -iname bl32.elf
Note that the output files are stored in a "release" directory within a platform directory *"rk3288" inside the "build" sub-directory. The sturcture should look something like this
user $
tree build
build/ `-- rk3288 `-- release |-- bl32 | |-- 16550_console.d | |-- 16550_console.o | |-- aeabi_ldivmod.d | |-- aeabi_ldivmod.o | |-- aeabi_memcpy.d | |-- aeabi_memcpy.o | |-- aeabi_memset.d | |-- aeabi_memset.o | |-- aeabi_uldivmod.d | |-- aeabi_uldivmod.o | |-- bakery_lock_coherent.d | |-- bakery_lock_coherent.o | |-- bl32 | | `-- sp_min | | |-- sp_min.ld | | `-- sp_min.ld.d | |-- bl32.dump | |-- bl32.elf | |-- bl32.map | |-- bl_aux_params.d | |-- bl_aux_params.o | |-- bl_common.d | |-- bl_common.o | |-- build_message.o | |-- cache_helpers.d | |-- cache_helpers.o | |-- cci.d | |-- cci.o | |-- context_mgmt.d | |-- context_mgmt.o | |-- cortex_a12.d | |-- cortex_a12.o | |-- cpu_data.d | |-- cpu_data.o | |-- cpu_data_array.d | |-- cpu_data_array.o | |-- cpu_helpers.d | |-- cpu_helpers.o | |-- crash_console_helpers.d | |-- crash_console_helpers.o | |-- ctzdi2.d | |-- ctzdi2.o | |-- debug.d | |-- debug.o | |-- delay_timer.d | |-- delay_timer.o | |-- desc_image_load.d | |-- desc_image_load.o | |-- divdi3.d | |-- divdi3.o | |-- divmoddi4.d | |-- divmoddi4.o | |-- entrypoint.d | |-- entrypoint.o | |-- errata_report.d | |-- errata_report.o | |-- generic_delay_timer.d | |-- generic_delay_timer.o | |-- gicdv2_helpers.d | |-- gicdv2_helpers.o | |-- gicv2_helpers.d | |-- gicv2_helpers.o | |-- gicv2_main.d | |-- gicv2_main.o | |-- lshrdi3.d | |-- lshrdi3.o | |-- misc_helpers.d | |-- misc_helpers.o | |-- multi_console.d | |-- multi_console.o | |-- params_setup.d | |-- params_setup.o | |-- plat_bl_common.d | |-- plat_bl_common.o | |-- plat_common.d | |-- plat_common.o | |-- plat_gicv2.d | |-- plat_gicv2.o | |-- plat_helpers.d | |-- plat_helpers.o | |-- plat_log_common.d | |-- plat_log_common.o | |-- plat_pm.d | |-- plat_pm.o | |-- plat_psci_common.d | |-- plat_psci_common.o | |-- plat_sip_calls.d | |-- plat_sip_calls.o | |-- plat_sp_min_common.d | |-- plat_sp_min_common.o | |-- plat_topology.d | |-- plat_topology.o | |-- platform_common.d | |-- platform_common.o | |-- platform_helpers.d | |-- platform_helpers.o | |-- platform_mp_stack.d | |-- platform_mp_stack.o | |-- pmu.d | |-- pmu.o | |-- pmu_sram_cpus_on.d | |-- pmu_sram_cpus_on.o | |-- popcountdi2.d | |-- popcountdi2.o | |-- popcountsi2.d | |-- popcountsi2.o | |-- psci_common.d | |-- psci_common.o | |-- psci_helpers.d | |-- psci_helpers.o | |-- psci_main.d | |-- psci_main.o | |-- psci_mem_protect.d | |-- psci_mem_protect.o | |-- psci_off.d | |-- psci_off.o | |-- psci_on.d | |-- psci_on.o | |-- psci_setup.d | |-- psci_setup.o | |-- psci_suspend.d | |-- psci_suspend.o | |-- psci_system_off.d | |-- psci_system_off.o | |-- rockchip_gicv2.d | |-- rockchip_gicv2.o | |-- rockchip_sip_svc.d | |-- rockchip_sip_svc.o | |-- runtime_svc.d | |-- runtime_svc.o | |-- secure.d | |-- secure.o | |-- soc.d | |-- soc.o | |-- sp_min_main.d | |-- sp_min_main.o | |-- sp_min_plat_setup.d | |-- sp_min_plat_setup.o | |-- spinlock.d | |-- spinlock.o | |-- std_svc_setup.d | |-- std_svc_setup.o | |-- tf_log.d | |-- tf_log.o | |-- udivmoddi4.d | |-- udivmoddi4.o | |-- wa_cve_2017_5715_icache_inv.d | |-- wa_cve_2017_5715_icache_inv.o | |-- xlat_tables.d | |-- xlat_tables.o | |-- xlat_tables_common.d | `-- xlat_tables_common.o |-- bl32.bin |-- fip.bin |-- lib | |-- libc.a | `-- libfdt.a |-- libc | |-- abort.d | |-- abort.o | |-- assert.d | |-- assert.o | |-- exit.d | |-- exit.o | |-- memchr.d | |-- memchr.o | |-- memcmp.d | |-- memcmp.o | |-- memcpy.d | |-- memcpy.o | |-- memmove.d | |-- memmove.o | |-- memrchr.d | |-- memrchr.o | |-- memset.d | |-- memset.o | |-- printf.d | |-- printf.o | |-- putchar.d | |-- putchar.o | |-- puts.d | |-- puts.o | |-- snprintf.d | |-- snprintf.o | |-- strchr.d | |-- strchr.o | |-- strcmp.d | |-- strcmp.o | |-- strlcat.d | |-- strlcat.o | |-- strlcpy.d | |-- strlcpy.o | |-- strlen.d | |-- strlen.o | |-- strncmp.d | |-- strncmp.o | |-- strnlen.d | |-- strnlen.o | |-- strrchr.d | |-- strrchr.o | |-- strtok.d | |-- strtok.o | |-- strtol.d | |-- strtol.o | |-- strtoll.d | |-- strtoll.o | |-- strtoul.d | |-- strtoul.o | |-- strtoull.d | `-- strtoull.o |-- libfdt | |-- fdt.d | |-- fdt.o | |-- fdt_addresses.d | |-- fdt_addresses.o | |-- fdt_empty_tree.d | |-- fdt_empty_tree.o | |-- fdt_ro.d | |-- fdt_ro.o | |-- fdt_rw.d | |-- fdt_rw.o | |-- fdt_strerror.d | |-- fdt_strerror.o | |-- fdt_sw.d | |-- fdt_sw.o | |-- fdt_wip.d | `-- fdt_wip.o |-- libwrapper `-- romlib 11 directories, 222 files
Save a copy somewhere safe --
user $
cp -av ./build/rk3288 ../
Prepare to Build U-Boot
This example will build and use peer-level directories for u-boot and rkbin, within a common project directory, to simplify relative addressing of command line parameters
Return to the project directory and get u-boot sources. The u-boot sub-directory will be created in the process:
user $
cd ..
user $
git clone https://source.denx.de/u-boot/u-boot.git
user $
cd u-boot
user $
git tag
v2023.10
Check out latest currently stable version:
user $
git checkout v2023.10
Instead of cloning the complete u-boot repository as shown in the steps above, you may save some time and disc space by cloning branch v2023.10 only:
user $
git clone --depth 1 --branch v2023.10 https://source.denx.de/u-boot/u-boot.git
Identify and load board-specific default configuration
user $
find ./ -iname *rk3288*_defconfig | grep tinker
./configs/tinker-rk3288_defconfig ./configs/tinker-s-rk3288_defconfig
U-Boot boot-flow(s)
The Rockchip u-boot README[2] indicates that there are two possible boot-flows involving the use of either the rockchip "miniloader" or a TPL/SPL build with ATF. See much more detail at http://opensource.rock-chips.com/wiki_Boot_option In particular, note the details illustrated in the graphic at http://opensource.rock-chips.com/images/thumb/c/cd/Rockchip_bootflow20181122.jpg/894px-Rockchip_bootflow20181122.jpg Source -- http://opensource.rock-chips.com/wiki_Boot_option
Build u-boot
user $
MAKEOPTS="-j$(nproc) -l$(nproc)" FEATURES=$FEATURES" -distcc -distcc-pump" PLAT=rk3288 CROSS_COMPILE=armv7a-unknown-linux-gnueabihf- make O=tinker-s-rk3288_output BL32=../rk3288/release/bl32/bl32.elf tinker-s-rk3288_defconfig all
make[1]: Entering directory '/home/joe/MyTinkerboardFiles/u-boot/tinker-s-rk3288_output' HOSTCC scripts/basic/fixdep GEN Makefile HOSTCC scripts/kconfig/conf.o YACC scripts/kconfig/zconf.tab.c LEX scripts/kconfig/zconf.lex.c HOSTCC scripts/kconfig/zconf.tab.o HOSTLD scripts/kconfig/conf # # configuration written to .config # GEN Makefile scripts/kconfig/conf --syncconfig Kconfig CFG u-boot.cfg GEN include/autoconf.mk GEN include/autoconf.mk.dep CFG spl/u-boot.cfg GEN spl/include/autoconf.mk ... CC tpl/fs/fs_internal.o AR tpl/fs/built-in.o LDS tpl/u-boot-spl.lds LD tpl/u-boot-tpl OBJCOPY tpl/u-boot-tpl-nodtb.bin COPY tpl/u-boot-tpl.bin SYM tpl/u-boot-tpl.sym COPY u-boot.dtb MKIMAGE u-boot-dtb.img BINMAN .binman_stamp OFCHK .config make[1]: Leaving directory '/home/joe/MyTinkerboardFiles/u-boot/tinker-s-rk3288_output'
Similar to the Linux kernel, menuconfig
can be used to make changes to the configuration. This is optional; there is no real need to make any changes.
If the serial console employs old hardware or is "noisy," the u-boot serial console baud rate setting can be reduced. Newer systems default to 1500000 baud, but the tinker-s-rk3288_defconfig evidently sets its default at 115200. If this is still too fast, it can be changed to e.g. 9600.
user $
grep -i baudrate .config
CONFIG_BAUDRATE=115200
user $
make menuconfig
Get rkbin and create trust.img[3]
From u-boot directory, cd .. to move to the parent project directory, then get rkbin sources (peer level to the project's u-boot directory) --
user $
git clone https://github.com/rockchip-linux/rkbin.git
user $
cd rkbin/
user $
./tools/trust_merger RKTRUST/RK3399TRUST.ini
Create uboot.img
If not already there, cd to /path/to/rkbin, then --
user $
./tools/loaderimage --pack --uboot ../u-boot/tinker-s-rk3288_output/u-boot-dtb.bin uboot.img
pack input ../u-boot/tinker-s-rk3288_output/u-boot-dtb.bin pack file size: 553000(540 KB) crc = 0x746c261e uboot version: U-Boot 2017.09-gc64e256218-200416 #yzc (Apr 29 2020 - 16:22:05)
pack uboot.img success!Installing u-boot
When powered on, the TinkerBoard S will attempt to find a bootloader in the following order:
- Removable eMMC - empty connector, not populated by default on 4c Plus
- microSD card - i.e. this is the only real option for where to put u-boot
Note that if the maskrom/eMMC Recovery jumper header is set in the "default/disable/park" position, the board will try to boot from the eMMC; if it is set in the "eMMC Recovery/MASKROM" position, it will try to boot from the SD card.
Once U-Boot is loaded on one of these devices, it can then be used to load the kernel from MMC/SD or USB external storage, or via the network. (There is no M.2 nor PCIe connector on the TinkerBoard/TInkerBoard S. By default, after exhausting other options, u-boot will connect to the local network's dhpc server, looking for tftp service from which to retrieve a bootable image (this might be considered a security concern).
Installing on microSD/eMMC
If writing to the eMMC, connect the board (microUSB) connector to a PC (USB-A).
If writing to a micro SD Card, put the card in a card reader and connect that to a PC/workstation USB port.
Note the device connected, and as root, enter the u-boot build directory, and write the images to the card.
For miniloader boot option, the Rockchip community (http://opensource.rock-chips.com/wiki_Boot_option) instructs loading these files built above at the associated sectors of the eMMC/SD Card --
dd if=idbloader.img of=<device> seek=64 dd if=uboot.img of=<device> seek=16384 dd if=trust.img of=<device> seek=24576 dd if=boot.img of=<device> seek=32768 dd if=rootfs.img of=<device> seek=262144
However, it also notes that "boot.img" may also be the boot partition/folder of the rootfs, wherein the extlinux/extlinux.conf, zImage, and tinker-s-rk3288.dtb file will reside (with optional initrd and/or optional grub.efi. The example below assumes no initrd, no grub.efi, and will append the rootfs information to kernel cli, etc.
There are separate instructions at the link above for loading files pertaining to TPL/SPL boot option)* Note that
uboot.img
is written starting at sector 16384, trust.img is written at sector 24576, and the scenario expects the boot.img
(or the boot directory/partition) to be at sector 32768. Make sure your card is partitioned such that 32768 is the start address for the boot partition (FAT 32), and there is no other file system installed below that sector.
- Be sure to replace
/dev/sdd
with the correct device!
Write output files to boot media
root #
dmesg | tail ### note information about device just connected
root #
cd /path/to/u-boot/
root #
dd if=tinker-s-rk3288_output/idbloader.img of=/dev/sdd seek=64
140+0 records in 140+0 records out 71680 bytes (72 kB, 70 KiB) copied, 0.0350433 s, 2.0 MB/s
root #
cd ../rkbin/
root #
dd if=uboot.img of=/dev/sdd seek=16384
8192+0 records in 8192+0 records out 4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.681352 s, 6.2 MB/s
root #
dd if=trust.img of=/dev/sdd seek=24576
8192+0 records in 8192+0 records out 4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.683164 s, 6.1 MB/s
Observing boot message with serial console
Before installing a Linux operating system, check to ensure that U-Boot is booting correctly. It may be possible to use a USB-to-TTL connector (such as this one or this one), though the author has found that those are not supported by Windows 11. Instead, the author used a mini-usb FTDI board such as are commonly used to program AVR microcontrollers that lack on-board USB support (see photo) and used PuTTy software on a Windows 11 desktop PC to monitor the serial console.
Connect the USB-TTL converter device ground pin to pin 34 (GND), its TX pin to pin in 36 (UART3_RX), and its RX pin to pin 37 (UART3_TX) See also the TInkerBoard Developer Guide for reference) to see the early boot up messages:
root #
screen /dev/ttyUSB0 115200
- Make sure RX and TX are not backwards
Optional: Adapting baud rate
Serial communication usually requires both sides of the communication to agree on a common baud rate. Though the tinker-s-rk3288_defconfig default seems to be set to 115200 baud, Rockchip otherwise normally defaults to 1500000 bauds, which may be too fast for common USB-to-serial adapters. This may garble or prevent visibility of boot-messages from u-boot. A much more common and widely supported, but slower baud rate is 115200 bauds. U-Boot can be configured to use this slower baud rate.
Use menuconfig
as described in #Build_U-Boot and reconfigure the symbol BAUDRATE
to 115200
. Rebuild u-boot and copy it to the SD-card. Now start your program of choice for serial communication
Linux PC as external serial console
root #
screen /dev/ttyUSB0 115200
Window s PC for external serial console
Expected boot messages
Now put the card into the device and power on. If successful, you should be able to see output like this (click to expand):
U-Boot TPL 2023.07.02 (Sep 24 2023 - 23:39:53) lpddr4_set_rate: change freq to 400MHz 0, 1 Channel 0: LPDDR4, 400MHz BW=32 Col=10 Bk=8 CS0 Row=16 CS=1 Die BW=16 Size=2048MB Channel 1: LPDDR4, 400MHz BW=32 Col=10 Bk=8 CS0 Row=16 CS=1 Die BW=16 Size=2048MB 256B stride lpddr4_set_rate: change freq to 800MHz 1, 0 Trying to boot from BOOTROM Returning to boot ROM... U-Boot SPL 2023.07.02 (Sep 24 2023 - 23:39:53 -0400) Trying to boot from MMC1 spl_load_fit_image: Skip load 'atf-5': image size is 0! NOTICE: BL31: v2.9(release):v2.9.0-dirty NOTICE: BL31: Built : 21:42:04, Sep 24 2023 U-Boot 2023.07.02 (Sep 24 2023 - 23:39:53 -0400) SoC: Rockchip rk3399 Reset cause: POR Model: Radxa ROCK Pi 4C DRAM: 4 GiB (effective 3.9 GiB) Core: 291 devices, 29 uclasses, devicetree: separate MMC: mmc@fe310000: 2, mmc@fe320000: 1, mmc@fe330000: 0 Loading Environment from MMC... Card did not respond to voltage select! : -110 *** Warning - No block device, using default environment In: serial Out: vidconsole Err: vidconsole Model: Radxa ROCK Pi 4C can't get vref-supply: -121 rockchip_dnl_key_pressed: adc_channel_single_shot fail! Net: eth0: ethernet@fe300000 Hit any key to stop autoboot: 0 ** Booting bootflow 'mmc@fe320000.bootdev.part_1' with script Loaded and running boot.scr!
- Early output from U-Boot TPL/SPL won't be shown on HDMI, only on serial
- You can press a key to interrupt the boot process and enter U-Boot's interactive shell
- You can find the list of commands and their syntax if you run
help
Booting a Linux system
Now that U-Boot installed on the SD card, the next step is to use it to boot a Linux system.
By default, U-Boot scans the partitions of each device (except SATA, see next section) to find something it knows how to load. The default supported file systems are ext2
, ext4
and FAT
, but there are a few others you can enable in U-Boot's menuconfig
. You will want your /boot partition to be formatted with one of those filesystems.
For TinkerBoard S using the miniloader boot flow described above, the boot directory should contain the kernel image, dtb file, and optional initrd and/or optional grub.efi. The extlinux/extlinux.conf file will identify the kernel (optionally initrd), and append text to the kernel command line, identifying the location of the rootfs. That should be all that is needed to boot this system. However, it is also possible to boot with a u-boot hush shell script compiled with the mkimage tool provided with u-boot sources or from the Gentoo dev-embedded/u-boot-tools package. Information about how to use that option follows in sections further below.
Verify extlinux.conf and /etc/fstab
root #
mount /dev/sdd2 /mnt/gentoo/
root #
mount /dev/sdd1 /mnt/gentoo/boot/
root #
cd /mnt/gentoo/boot/
root #
nano extlinux/extlinux.conf
kernel /zImage fdt /rk3288-tinker-s.dtbappend net.ifnames=0 earlyprintk quiet splash plymouth.ignore-serial-consoles console=tty1 root=/dev/mmcblk1p2 rw init=/sbin/init
root #
nano /mnt/gentoo/etc/fstab
UUID="aaaabbbb-cccc-dddd-1234-eeeeffff2222" / ext4 noatime 0 1 UUID="DDDD-CCCC" /boot vfat defaults 0 2 /var/cache/swap/swap1 none swap sw 0 0 /dev/mapper/vg_demo-srv /srv ext4 noatime 0 0
root #
cd
root #
umount -R /mnt/gentoo
root #
sync
Now remove the SD card from the reader, put it into the reader on the TinkerBoard S, and boot...
NO GO :-( ...
Creating boot.scr [work in progress - draft copied from Rock4c+ page]
One thing it can load boot.scr
, which will contain commands for U-Boot to execute. This will be in your /boot partition along with your kernel and device tree binary.
First, create a file boot.cmd
. The example below includes a lot of extra stuff to facilitate exploration and debugging, but it can be significantly simplified --
echo "Loaded and running boot.scr!"
#setenv userEnv "joetooEnv.txt"
# defaults
setenv load_addr "0x9000000"
setenv overlay_error "false"
setenv rootdev "/dev/mmcblk0p1"
setenv verbosity "1"
setenv console "both"
setenv bootlogo "false"
setenv rootfstype "ext4"
if test -z "$bootargs"; then
setenv bootargs root=${rootdev} rootdelay=5
fi
# print some debugging info
echo "-----[ Initial State ]-----------------------------------"
#echo "userEnv..........: "${userEnv}
echo "load_addr........: "${load_addr}
echo "filesize.........: "${filesize}
echo "rootdev..........: "${rootdev}
echo "devtype..........: "${devtype}
echo "devnum...........: "${devnum}
echo "prefix...........: "${prefix}
echo "distro_bootpart..: "${distro_bootpart}
echo "verbosity........: "${verbosity}
echo "console..........: "${console}
echo "consoleargs......: "${consoleargs}
echo "bootlogo.........: "${bootlogo}
echo "rootfstype.......: "${rootfstype}
echo "earlycon.........: "${earlycon}
echo "overlays.........: "${overlays}
echo "overlay_prefix...: "${overlay_prefix}
echo "fdtfile..........: "${fdtfile}
echo "fdt_addr_r.......: "${fdt_addr_r}
echo "imagefile........: "${imagefile}
echo "kernel_addr_r....: "${kernel_addr_r}
echo "initrdfile.......: "${initrdfile}
echo "ramdisk_addr_r...: "${ramdisk_addr_r}
echo "partuuid.........: "${partuuid}
echo "usbstoragequirks.: "${usbstoragequirks}
echo "extraargs........: "${extraargs}
echo "extraboardargs...: "${extraboardargs}
echo "bootargs.........: "${bootargs}
echo "--------------------------------------------------------"
# Override/overwrite defaults per user's environment selections
echo "Ok - I am about to try reading joetooEnv.txt..."
if test -e ${devtype} ${devnum} ${prefix}joetooEnv.txt; then
load ${devtype} ${devnum} ${load_addr} ${prefix}joetooEnv.txt
env import -t ${load_addr} ${filesize}
else
echo "Did not find or load joetooEnv.txt"
fi
# Manage console settings
if test "${console}" = "display" || test "${console}" = "both"; then setenv consoleargs "console=tty1"; fi
if test "${console}" = "serial" || test "${console}" = "both"; then setenv consoleargs "console=ttyS2,115200 ${consoleargs}"; fi
if test "${earlycon}" = "on"; then setenv consoleargs "earlycon ${consoleargs}"; fi
if test "${bootlogo}" = "true"; then
setenv consoleargs "splash plymouth.ignore-serial-consoles ${consoleargs}"
else
setenv consoleargs "splash=verbose ${consoleargs}"
fi
# get PARTUUID of first partition on SD/eMMC the boot script was loaded from
if test "${devtype}" = "mmc"; then part uuid mmc ${devnum}:1 partuuid; fi
# update bootargs
#setenv bootargs "root=${rootdev} rootwait rootfstype=${rootfstype} ${consoleargs} consoleblank=0 loglevel=${verbosity} ubootpart=${partuuid} usb-storage.quirks=${usbstoragequirks} ${extraargs} ${extraboardargs}"
setenv bootargs "root=${rootdev} rootwait rootfstype=${rootfstype} ${consoleargs} consoleblank=0 loglevel=${verbosity} usb-storage.quirks=${usbstoragequirks} ${extraargs} ${extraboardargs}"
echo "-----[ Potentially Updated State ]-----------------------"
#echo "userEnv..........: "${userEnv}
echo "load_addr........: "${load_addr}
echo "filesize.........: "${filesize}
echo "rootdev..........: "${rootdev}
echo "devtype..........: "${devtype}
echo "devnum...........: "${devnum}
echo "prefix...........: "${prefix}
echo "distro_bootpart..: "${distro_bootpart}
echo "verbosity........: "${verbosity}
echo "console..........: "${console}
echo "consoleargs......: "${consoleargs}
echo "bootlogo.........: "${bootlogo}
echo "rootfstype.......: "${rootfstype}
echo "earlycon.........: "${earlycon}
echo "overlays.........: "${overlays}
echo "overlay_prefix...: "${overlay_prefix}
echo "fdtfile..........: "${fdtfile}
echo "fdt_addr_r.......: "${fdt_addr_r}
echo "imagefile........: "${imagefile}
echo "kernel_addr_r....: "${kernel_addr_r}
echo "initrdfile.......: "${initrdfile}
echo "ramdisk_addr_r...: "${ramdisk_addr_r}
echo "partuuid.........: "${partuuid}
echo "usbstoragequirks.: "${usbstoragequirks}
echo "extraargs........: "${extraargs}
echo "extraboardargs...: "${extraboardargs}
echo "bootargs.........: "${bootargs}
echo "-----[ now env print -a ]---------------------------------"
env print -a
# Load device tree file and kernel (to do: initramfs option)
# device tree - note that it finds the file in the "dtb" directory
echo "Loading device tree from ${devtype} ${devnum}:${distro_bootpart}..."
load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}dtb/${overlay_prefix}/${fdtfile}
echo "Loading initrd from ${devtype} ${devnum}:${distro_bootpart}..."
load ${devtype} ${devnum} ${ramdisk_addr_r} ${prefix}${initrdfile}
echo "Loading kernel from ${devtype} ${devnum}:${distro_bootpart}..."
load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} ${prefix}${imagefile}
# Load overlays (to do, if needed)
# Boot!
echo "Booting with arguments: ${bootargs}"
#booti ${kernel_addr_r} - ${fdt_addr_r}
booti ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
# Recompile instruction
#
# Cross-compiling:
# cd to u-boot directory holding boot.cmd and run
# mkimage -C none -A arm64 -T script -d boot.cmd boot.scr
# then copy boot.scr, boot.cmd, and joetooEnv.txt to the /boot partition
# of your target system eMMC or microSD card
#
# If modifying an existing system (from said system)
# mkimage -C none -A arm64 -T script -d /boot/boot.cmd /boot/boot.scr
verbosity=6
earlycon=on
bootlogo=true
overlay_prefix=rockchip
fdtfile=rk3399-rock-4c-plus.dtb
imagefile=Image
initrdfile=uInitrd
rootdev=UUID=8870f459-a625-47c4-84f2-21f3a24b1818
rootfstype=ext4
extraargs=init=/sbin/init
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u
Be sure to change
rootdev=
to point to your actual root partition!
This can by done by UUID, as in this example, more portably than by path to block device, like "/dev/mmcblk0p1" -- but either way is validThen, compile it to boot.scr
:
root #
mkimage -C none -A arm64 -T script -d boot.cmd boot.scr
mkimage
can be used from either the bin directory in your U-Boot build directory or from dev-embedded/u-boot-tools- Create a Makefile or a shell script so you don't have to look up the command above next time you need to edit
If the /boot partition is on microSD, it should work without additional steps.