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imx7: Update CONFIG_SPL_STACK defaults in Kconfig

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Update the Kconfig entry to have the correct defaults for i.MX7
platforms, and move the existing large comment from imx7_spl.h to
doc/imx/common/imx7.txt so that it's not lost.

Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Tom Rini
2022-05-26 13:46:32 -04:00
parent 23780398b5
commit 8b83b53a8d
11 changed files with 25 additions and 40 deletions
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23
include/configs/imx7_spl.h
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@@ -11,29 +11,6 @@
#define __IMX7_SPL_CONFIG_H
#ifdef CONFIG_SPL
/*
* see figure 6-22 in i.MX 7Dual/Solo Reference manuals:
* - IMX7D/S OCRAM free area RAM (OCRAM) is from 0x00910000 to
* 0x00946C00.
* - Set the stack at the end of the free area section, at 0x00946BB8.
* - The BOOT ROM loads what they consider the firmware image
* which consists of a 4K header in front of us that contains the IVT, DCD
* and some padding. However, the manual also states that the ROM uses the
* OCRAM_EPCD and OCRAM_PXP areas for itself. While the SPL is free to use
* this range for stack and malloc, the SPL itself must fit below 0x920000,
* or the image will be truncated in at least some boot modes like USB SDP.
* Thus our max size is really 0x00920000 - 0x00912000. If necessary,
* CONFIG_SPL_TEXT_BASE could be moved to 0x00911000 to gain 4KB of space
* for the SPL, but 56KB should be more than enough for the SPL.
*/
/*
* Pad SPL to 68KB (4KB header + 56KB max size + 8KB extra padding)
* The extra padding could be removed, but this value was used historically
* based on an incorrect CONFIG_SPL_MAX_SIZE definition.
* This allows to write the SPL/U-Boot combination generated with
* u-boot-with-spl.imx directly to a boot media (given that boot media specific
* offset is configured properly).
*/
/* MMC support */
#if defined(CONFIG_SPL_MMC)