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From: Peter Rosin <peda@axentia.se>
To: Rouven Czerwinski <r.czerwinski@pengutronix.de>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Ahmad Fatoum <ahmad@a3f.at>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH 3/4] Revert "ARM: mmu: use client domain permissions to support ARMv7 eXecute Never"
Date: Sun, 19 Sep 2021 22:33:07 +0200	[thread overview]
Message-ID: <148368af-c744-3cde-1a5e-f895c6e57784@axentia.se> (raw)
In-Reply-To: <02b09328-e300-f36e-4cc4-daa7afb47ad5@axentia.se>

On 2021-09-19 09:50, Peter Rosin wrote:
> On 2021-09-19 09:06, Rouven Czerwinski wrote:
>> processors. Are you calling into SAMA5D3 ROM code somewhere? If so an
> 
> *I* am not calling anything. Maybe the board code for sama5d3xek is,
> but I have no idea as it's not "my" code. How can I figure out if it
> does?

I did some digging and I think calling into any ROM can be ruled out
in this case. The only ROM that I can find in the sama5d3x datasheet
is this one:

- One 160 Kbyte Internal ROM Single-cycle Access at System Speed,
  Embedded Boot Loader: Boot on 8-bit NAND Flash, SDCard, eMMC,
  serial DataFlash, selectable Order

AFAICT, the internal ROM only contains the first level boot loader,
so the ROM is presumably never used after that stage. That said,
I'm by no means an expert on the internal details of the sama5d3x...

That, and there's no external ROM on the address bus.

Cheers,
Peter

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  reply	other threads:[~2021-09-19 20:35 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 22:37 at91 sama5d3 "regressions" Peter Rosin
2021-09-17 22:39 ` [PATCH 1/4] common.h: reintroduce region_overlap() as, old_region_overlap() Peter Rosin
2021-09-17 22:39 ` [PATCH 2/4] ARM: copy data if there is a region overlap Peter Rosin
2021-09-17 22:40 ` [PATCH 3/4] Revert "ARM: mmu: use client domain permissions to support ARMv7 eXecute Never" Peter Rosin
2021-09-19  7:06   ` Rouven Czerwinski
2021-09-19  7:50     ` Peter Rosin
2021-09-19 20:33       ` Peter Rosin [this message]
2021-09-20  9:14       ` Ahmad Fatoum
2021-09-20 10:22         ` Peter Rosin
2021-09-17 22:41 ` [PATCH 4/4] lds: the RO_DATA_SECTION macro does not work on my SAMA5D3 board Peter Rosin
2021-09-17 23:57 ` at91 sama5d3 "regressions" Peter Rosin
2021-09-19  6:32   ` Peter Rosin
2021-09-22  7:06     ` Ahmad Fatoum
2021-09-22  7:41       ` Peter Rosin

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