Re[2]: NOR memory driver fail with MMU enabled

From: "Alexander Shiyan" <shc_work@mail.ru>
To: "Sascha Hauer" <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re[2]: NOR memory driver fail with MMU enabled
Date: Wed, 06 Feb 2013 17:13:48 +0400	[thread overview]
Message-ID: <1360156428.804491817@f43.mail.ru> (raw)
In-Reply-To: <20130206121134.GE1906@pengutronix.de>

...
> > I have a problem with NOR flash when enabling MMU.
> > Probably this happen due NOR start address is 0x0.
> > Should we a remap memory addresses same as we do it for kernel? 
> > Or can someone tell what could be the problem?
> 
> This is because the zero page is set to faulting so that you can
> catch NULL pointer exceptions. You could disable this (see
> vectors_init), but then you can't catch NULL pointer exceptions
> anymore. So the best you can do is use map_io_sections and map
> your flash to some free region, maybe like this:
> 
> map_io_sections(0x0, (void *)SZ_1M, SZ_32M);
> 
> Then register your flash flash with address 1M instead of 0x0.

Thanks Sascha, this has helped me.

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