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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
Download patch file Download diff file Expand all files Collapse all files

5
hw/misc/aspeed_scu.c
View file

@ -85,7 +85,6 @@
#define BMC_REV TO_REG(0x19C)
#define BMC_DEV_ID TO_REG(0x1A4)
#define PROT_KEY_UNLOCK 0x1688A8A8
#define SCU_IO_REGION_SIZE 0x1000
static const uint32_t ast2400_a0_resets[ASPEED_SCU_NR_REGS] = {
@ -192,7 +191,7 @@ static void aspeed_scu_write(void *opaque, hwaddr offset, uint64_t data,
}
if (reg > PROT_KEY && reg < CPU2_BASE_SEG1 &&
s->regs[PROT_KEY] != PROT_KEY_UNLOCK) {
s->regs[PROT_KEY] != ASPEED_SCU_PROT_KEY) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: SCU is locked!\n", __func__);
return;
}
@ -246,6 +245,7 @@ static void aspeed_scu_reset(DeviceState *dev)
s->regs[SILICON_REV] = s->silicon_rev;
s->regs[HW_STRAP1] = s->hw_strap1;
s->regs[HW_STRAP2] = s->hw_strap2;
s->regs[PROT_KEY] = s->hw_prot_key;
}
static uint32_t aspeed_silicon_revs[] = {
@ -299,6 +299,7 @@ static Property aspeed_scu_properties[] = {
DEFINE_PROP_UINT32("silicon-rev", AspeedSCUState, silicon_rev, 0),
DEFINE_PROP_UINT32("hw-strap1", AspeedSCUState, hw_strap1, 0),
DEFINE_PROP_UINT32("hw-strap2", AspeedSCUState, hw_strap2, 0),
DEFINE_PROP_UINT32("hw-prot-key", AspeedSCUState, hw_prot_key, 0),
DEFINE_PROP_END_OF_LIST(),
};