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diff --git a/Documentation/boards/rk3288.rst b/Documentation/boards/rk3288.rst new file mode 100644 index 0000000000..3acca74302 --- /dev/null +++ b/Documentation/boards/rk3288.rst @@ -0,0 +1,57 @@ +Rockchip RK3288 +=============== + +The RK3288 SoC has a two stage boot process. The booting is completed in two +consecutive stages. The binary for the 1st stage is referred to as the +Secondary Program Loader (SPL). The binary for the 2nd stage is simply referred to +as barebox. +SPL is a non-interactive loader and is only used to boot the 2nd stage loader. + +At this moment barebox can only be used as a 2nd stage bootloader. +Starting barebox requires another bootloader which will do the very basic +SDRAM initialization for us. We can use the u-boot for that. + +Building barebox +---------------- + +The RK3288 boards in barebox are covered by the ``rk3288_defconfig``. +The resulting images will be placed under ``images/``: + +:: + barebox-rk3288-phycore-som.img + + +Starting and updating barebox +----------------------------- + +SD/MMC +^^^^^^ + +For the first stage bootloader we will need an u-boot image. A detailed +description on how to build and flash an RK3288 SPL image can be found in the +u-boot source ``u-boot/doc/README.rockchip``. + +U-boot requires an image with a special header. + + mkimage -A arm -T firmware -C none -O u-boot -a 0x02000000 -e 0 -n "barebox image" -d images/barebox-rk3288-phycore-som.img barebox.img + +To write an image that boots from an SD card (assumed to be /dev/sdc): + + sudo dd if=u-boot/u-boot-spl-dtb.bin of=/dev/sdc seek=64 bs=512 + sudo dd if=barebox.img of=/dev/sdc seek=256 bs=512 + +This puts the Rockchip header and SPL image first and then places the barebox +image at block 256 (i.e. 128KB from the start of the SD card). This +corresponds with this setting in U-Boot: + + #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 256 + +RK3288 Boards +------------- + +.. toctree:: + :glob: + :numbered: + :maxdepth: 1 + + rk3288/* |