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authorXu Ziyuan <xzy.xu@rock-chips.com>2016-07-12 19:09:49 +0800
committerSimon Glass <sjg@chromium.org>2016-07-25 20:44:18 -0600
commitb47ea79219f1de43fa21456c6c60c8390b8755d2 (patch)
tree7639d25c4dba2ed0fc87bd153111ba33a1dc2fa7 /doc/README.rockchip
parent4579720412744dd13266a3505bb38ce2da819b4f (diff)
rockchip: add option to change method of loading u-boot
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>
Diffstat (limited to 'doc/README.rockchip')
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diff --git a/doc/README.rockchip b/doc/README.rockchip
index e0572c80b9..182e3aedf6 100644
--- a/doc/README.rockchip
+++ b/doc/README.rockchip
@@ -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: