ARM: armv7: Add early stack for erratum workarounds
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>
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 81edec0..0cb6dd3 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -205,6 +205,15 @@
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