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rockchip: add option to change method of loading u-boot

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If we would like to boot from SD card, we have to implement mmc driver
in SPL stage, and get a slightly large SPL binary. Rockchip SoC's
bootrom code has the ability to load spl and u-boot, then boot.

If CONFIG_ROCKCHIP_SPL_BACK_TO_BROM is enabled, the spl will return to
bootrom in board_init_f(), then bootrom loads u-boot binary.

Loading sequence after rework:
bootrom ==> spl ==> bootrom ==> u-boot

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
Fixed up spelling of U-Boot, boorom, opinion->option, Rochchip:
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Xu Ziyuan
2016-07-12 19:09:49 +08:00
committed by Simon Glass
parent 4579720412
commit b47ea79219
8 changed files with 66 additions and 3 deletions
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14
doc/README.rockchip
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@@ -119,6 +119,20 @@ something like:
Hit any key to stop autoboot: 0
=>
The rockchip bootrom can load and boot an initial spl, then continue to
load a second-level bootloader(ie. U-BOOT) as soon as it returns to bootrom.
Therefore RK3288 has another loading sequence like RK3036. The option of
U-Boot is controlled with this setting in U-Boot:
#define CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
You can create the image via the following operations:
./firefly-rk3288/tools/mkimage -n rk3288 -T rksd -d \
firefly-rk3288/spl/u-boot-spl-dtb.bin out && \
cat firefly-rk3288/u-boot-dtb.bin >> out && \
sudo dd if=out of=/dev/sdc seek=64
If you have an HDMI cable attached you should see a video console.
For evb_rk3036 board: