U-Boot SPL on GXL
Progress
The primary goal is to be able to boot U-Boot as BL33 and mainline linux.
Broken - Doesn't work
Untested - Needs testing
Works - Implemented and functional
TODO - Needs someone to write the solving code
Log
GXL:BL1:9ac50e:bb16dc;FEAT:ADFC318C:0;POC:0;RCY:0;USB:0;SPI:0;CHK:A7;EMMC:400;NAND:81;SD:0;READ:0;0.0;CHK:0; <de՝}Յ> SPL: Restarting execution at EL3 <debug_uart> U-Boot SPL 2023.10-rc3-00106-g83b2ac0c2c-dirty (Nov 23 2023 - 16:48:02 +0100) Trying to boot from MMC1 NOTICE: BL31: v2.9(debug):v2.8-1741-g84de50c7d-dirty NOTICE: BL31: Built : 15:45:51, Nov 23 2023 INFO: ARM GICv2 driver initialized mpu_config_enable:ok [Image: gxl_v1.1.3308-45470c4 2018-04-12 16:22:58 jenkins@walle02-sh] OPS=0x84 21 0d 84 00 97 d2 f2 c8 c8 5f 33 10 ea b7 86 fa [4.099065 Inits done] secure task start! high task start! low task start! INFO: BL31: Initializing runtime services INFO: BL31: cortex_a53: CPU workaround for erratum 855873 was applied WARNING: BL31: cortex_a53: CPU workaround for erratum 1530924 was missing! INFO: BL31: Preparing for EL3 exit to normal world INFO: Entry point address = 0x1000000 INFO: SPSR = 0x3c9 <debug_uart> U-Boot 2023.10-rc3-00106-g83b2ac0c2c-dirty (Nov 23 2023 - 16:48:02 +0100) libretech-cc Model: Libre Computer AML-S905X-CC SoC: Amlogic Meson GXL (S905X) Revision 21:d (84:2) DRAM: 2 GiB (effective 1 GiB) Core: 168 devices, 27 uclasses, devicetree: separate MMC: mmc@72000: 0, mmc@74000: 1 Loading Environment from nowhere... OK In: serial Out: vidconsole,serial Err: vidconsole,serial Net: eth0: ethernet@c9410000 Hit any key to stop autoboot: 0 switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1... Found /extlinux/extlinux.conf Retrieving file: /extlinux/extlinux.conf boot prev kernel 1: postmarketOS Enter choice: 1: postmarketOS Retrieving file: /vmlinuz Retrieving file: /initramfs append: console=null PMOS_NO_OUTPUT_REDIRECT Retrieving file: /meson-gxbb-kii-pro.dtb Moving Image from 0x8080000 to 0x8200000, end=9a00000 ## Flattened Device Tree blob at 08008000 Booting using the fdt blob at 0x8008000 Working FDT set to 8008000 Loading Ramdisk to 3ac32000, end 3af322be ... OK Loading Device Tree to 000000003ac28000, end 000000003ac31c37 ... OK Working FDT set to 3ac28000 Starting kernel ...
What works
- DDR initialisation: Partial (DDR3 only)
- PLL initialisation: Works
- Power initialisation: ?
- UART: Works
- Storage
- eMMC: Broken
- SD: Works
- SPI: Untested
- NAND: Untested
- USB: TODO
How to compile
How to compile
Prerequisites
- Proprietary SCP firmware and libre BL301 addon
FerassElHafidi's TF-A fork (upstream/amlogic BL31 won't work because of how SPL passes arguments to BL31)
- U-Boot and all its dependencies
Steps
- Preparation:
$ export CROSS_COMPILE=aarch64-linux-gnu- $ git clone https://git.vitali64.duckdns.org/misc/u-boot-kii-pro.git -b wip/spl u-boot $ git clone https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git -b wip/gxl/spl_support tf-a $ git clone https://github.com/LibreELEC/amlogic-boot-fip.git fip
- Compile TF-A BL31 fork (Amlogic BL31 and upstream will not work):
$ cd tf-a $ make PLAT=gxl DEBUG=1 bl31 $ cd ..
- Merge BL301 and the SCP firmware:
$ cd fip/${board}/
$ make ./bl30_new.bin
$ cp ./bl30_new.bin ../bl30_with_bl301.bin
$ cd ..- Build U-Boot SPL:
$ cd u-boot $ export BL31=../tf-a/build/gxl/debug/bl31.bin SCP=../fip/bl30_with_bl301.bin $ make libretech-cc_defconfig # TODO: other defconfigs $ make -j8
- Write to SD card/eMMC:
# dd if=u-boot-gxl-with-spl.bin of=/dev/boot_device conv=fsync,notrunc bs=512 seek=1
Known issues
- eMMC doesn't work