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ARM: armv7: Add early stack for erratum workarounds

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Some erratum workarounds call into C code before the stack
is setup, this can lead to values pushed onto the stack
being lost, firewall exceptions, and other undefined behavior.

Setup a temporary stack to allow these functions to work
correctly.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Andrew F. Davis 2018-11-19 14:47:53 -06:00 committed by Tom Rini
parent 958d46b53f
commit a0106c82d6
1 changed files with 9 additions and 0 deletions
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9
arch/arm/cpu/armv7/start.S
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@ -205,6 +205,15 @@ ENTRY(cpu_init_cp15)
mov r2, r3, lsl #4 @ shift variant field for combined value
orr r2, r4, r2 @ r2 has combined CPU variant + revision
/* Early stack for ERRATA that needs into call C code */
#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
ldr r0, =(CONFIG_SPL_STACK)
#else
ldr r0, =(CONFIG_SYS_INIT_SP_ADDR)
#endif
bic r0, r0, #7 /* 8-byte alignment for ABI compliance */
mov sp, r0
#ifdef CONFIG_ARM_ERRATA_798870
cmp r2, #0x30 @ Applies to lower than R3p0
bge skip_errata_798870 @ skip if not affected rev