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hw/arm/aspeed: Unlock SCU when running kernel

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The ASPEED hardware contains a lock register for the SCU that disables
any writes to the SCU when it is locked. The machine comes up with the
lock enabled, but on all known hardware u-boot will unlock it and leave
it unlocked when loading the kernel.

This means the kernel expects the SCU to be unlocked. When booting from
an emulated ROM the normal u-boot unlock path is executed. Things don't
go well when booting using the -kernel command line, as u-boot does not
run first.

Change behaviour so that when a kernel is passed to the machine, set the
reset value of the SCU to be unlocked.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20171114122018.12204-1-joel@jms.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Joel Stanley 2017-11-14 22:50:18 +10:30 • committed by Peter Maydell
parent 50cd71b0d3
commit b6e70d1d7f
4 changed files with 17 additions and 2 deletions
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3
include/hw/misc/aspeed_scu.h
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@ -29,6 +29,7 @@ typedef struct AspeedSCUState {
uint32_t silicon_rev;
uint32_t hw_strap1;
uint32_t hw_strap2;
uint32_t hw_prot_key;
} AspeedSCUState;
#define AST2400_A0_SILICON_REV 0x02000303U
@ -38,6 +39,8 @@ typedef struct AspeedSCUState {
extern bool is_supported_silicon_rev(uint32_t silicon_rev);
#define ASPEED_SCU_PROT_KEY 0x1688A8A8
/*
* Extracted from Aspeed SDK v00.03.21. Fixes and extra definitions
* were added.