Re: [PATCH 1/3] ARM: i.MX: boot: correctly handle SRC_SBMR1 override via SRC_GPR9

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On Mon, Apr 27, 2020 at 09:13:49AM +0200, Ahmad Fatoum wrote:
> `mw 0x20d8040 0x08000030; mw 0x20d8044 0x10000000; reset` issued on an
> i.MX6Q forces boot from the ecspi1. This is because the BootROM reads
> the boot mode out of SRC_GPR9 instead of SRC_SBMR1 whenever SRC_GPR10
> has its 28th bit set.

Is this documented somewhere? The reference Manual marks SRC_GPR9 and
SRC_GPR10 as

| This register is used by the ROM code and should not be used
| by application software.

And why do you depend on this behaviour?

Sascha

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