Re: [U-Boot] [PATCH v2] ARM: uniphier: add weird workaround code for LD20

2017-05-12 22:49 GMT+09:00 Masahiro Yamada yamada.masahiro@socionext.com:

When booting from ARM Trusted Firmware, U-Boot runs in EL1-NS. The boot flow is as follows: BL1 -> BL2 -> BL31 -> BL33 (i.e. U-Boot)

This boot sequence works fine for LD11 SoC (Cortex-A53), but LD20 SoC (Cortex-A72) hangs in U-Boot. The solution I found is to read sctlr_el1 and write back the value as-is. This should be no effect, but surprisingly fixes the problem and LD20 SoC boots. I do not know why.

Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com

Applied to u-boot-uniphier/master.