[U-Boot] [RFC PATCH v2] ARM: Avoid compiler optimization for usages of readb, writeb and friends.

[John Rigby]

On Sun, Dec 19, 2010 at 3:22 AM, Alexander Holler <holler at ahsoftware.de> wrote:
> side effects here. Reading NAND now fails on my BeagleBoard. Regardless
> if I use gcc 4.3.5 or gcc 4.5.1, after applying that patch the wrong ID
> of the NAND is read. In nand_get_flash_type()
> (drivers/mtd/nand/nand_base.c) without that patch I will get the following:
>
> *maf_id: 44, dev_id: 186
>
> with the patch the following is read:
>
> *maf_id: 128, dev_id: 85
The nand_get_flash_type routine reads these id's twice and compares
them.  Do your see an error message like this?

second ID read did not match

>
> Which just is wrong.
>
> I haven't looked further up to now, maybe thats just a side effect of
> some wrong clock settings because of different timings through those
> barrieres or whatever.
>
> Regards,
>
> Alexander
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