From mboxrd@z Thu Jan  1 00:00:00 1970
From: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Date: Tue, 25 Jul 2017 12:58:12 +0300
Subject: [U-Boot] CPU errata workarounds are using the SPL stack before it
 is initialized
Message-ID: <20170725125812.598b4511@i7>
List-Id: <u-boot.lists.denx.de>
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To: u-boot@lists.denx.de

Hello,

Currently the code in 'arch/arm/cpu/armv7/start.S' calls
the 'cpu_init_cp15' function before 'cpu_init_crit'. The initial
SPL stack is initialized in 'lowlevel_init', which is called
from 'cpu_init_crit'. But 'cpu_init_cp15' is already using stack
when applying errata workarounds. Here is one example:

#ifdef CONFIG_ARM_ERRATA_430973
	cmp	r2, #0x21		@ Only on < r2p1
	bge	skip_errata_430973

	mrc	p15, 0, r0, c1, c0, 1	@ Read ACR
	orr	r0, r0, #(0x1 << 6)	@ Set IBE bit
	push	{r1-r5}			@ Save the cpu info registers
	bl	v7_arch_cp15_set_acr
	pop	{r1-r5}			@ Restore the cpu info - fall through

skip_errata_430973:
#endif

-- 
Best regards,
Siarhei Siamashka