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imx8: Jump from alias to OCRAM address at SPL init

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When running SPL on iMX8, the A core starts at address 0
which is a alias to OCRAM 0x100000.
The alias only map first 96KB of OCRAM, so this require the
SPL size can't beyond 96KB. But when using SPL DM, the size increase
significantly and may exceed 96KB.
So to fix the problem, we will change SPL linker address to OCRAM
address 0x100000. And then jump to the absolute address not the PC relative
address for entering OCRAM.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
This commit is contained in:
Ye Li
2019-07-12 09:33:52 +00:00
committed by Stefano Babic
parent 5e93871305
commit 9a2738581a
2 changed files with 22 additions and 0 deletions
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1
arch/arm/Kconfig
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@@ -788,6 +788,7 @@ config ARCH_IMX8
select ARM64
select DM
select OF_CONTROL
select ENABLE_ARM_SOC_BOOT0_HOOK
config ARCH_IMX8M
bool "NXP i.MX8M platform"

21
arch/arm/include/asm/arch-imx8/boot0.h Normal file
View File

@@ -0,0 +1,21 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2019 NXP
*/
#if defined(CONFIG_SPL_BUILD)
/*
* We use absolute address not PC relative address to jump.
* When running SPL on iMX8, the A core starts at address 0, a alias to OCRAM 0x100000,
* our linker address for SPL is from 0x100000. So using absolute address can jump to
* the OCRAM address from the alias.
* The alias only map first 96KB of OCRAM, so this require the SPL size can't beyond 96KB.
* But when using SPL DM, the size increase significantly and may exceed 96KB.
* That's why we have to jump to OCRAM.
*/
ldr x0, =reset
br x0
#else
b reset
#endif