]> Git Repo - u-boot.git/commit
ARM: uniphier: add weird workaround code for LD20
authorMasahiro Yamada <[email protected]>
Fri, 12 May 2017 13:49:02 +0000 (22:49 +0900)
committerMasahiro Yamada <[email protected]>
Wed, 17 May 2017 12:50:31 +0000 (21:50 +0900)
commit45f41c134baf5ff1bbf59d33027f6c79884fa4d9
tree1bad533a1d01e3c6fc2d384c46b8e67794b3b333
parent8d3064d9a93a14fdec9e6963766ed77cf3f826a1
ARM: uniphier: add weird workaround code for LD20

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 for LD20 to boot.
I do not know why.

Signed-off-by: Masahiro Yamada <[email protected]>
arch/arm/mach-uniphier/arm64/Makefile
arch/arm/mach-uniphier/arm64/lowlevel_init.S [new file with mode: 0644]
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