rockchip: Use an external TPL binary on RK3568
Rockchip SoCs typically use U-Boot TPL to initialize DRAM, then jumps
back to BootRom to load next stage, U-Boot SPL, into DRAM. BootRom then
jumps to U-Boot SPL to continue the normal boot flow.
However, there is no support to initialize DRAM on RK35xx SoCs using
U-Boot TPL and instead an external TPL binary must be used to generate a
bootable u-boot-rockchip.bin image.
Add CONFIG_ROCKCHIP_EXTERNAL_TPL to indicate that an external TPL should
be used. Build U-Boot with ROCKCHIP_TPL=/path/to/ddr.bin to generate a
bootable u-boot-rockchip.bin image for RK3568.
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Eugen Hristev <eugen.hristev@collabora.com>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index b678ec4..0b191b3 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -401,6 +401,14 @@
common board is a basic TPL board init which can be shared for most
of SoCs to avoid copy-paste for different SoCs.
+config ROCKCHIP_EXTERNAL_TPL
+ bool "Use external TPL binary"
+ default y if ROCKCHIP_RK3568
+ help
+ Some Rockchip SoCs require an external TPL to initialize DRAM.
+ Enable this option and build with ROCKCHIP_TPL=/path/to/ddr.bin to
+ include the external TPL in the image built by binman.
+
config ROCKCHIP_BOOT_MODE_REG
hex "Rockchip boot mode flag register address"
help