Re: Boot from SD fail after 2013.02

From: Sascha Hauer <s.hauer@pengutronix.de>
To: Alexander Shiyan <shc_work@mail.ru>
Cc: barebox@lists.infradead.org
Subject: Re: Boot from SD fail after 2013.02
Date: Thu, 18 Apr 2013 20:23:17 +0200	[thread overview]
Message-ID: <20130418182317.GJ1906@pengutronix.de> (raw)
In-Reply-To: <1366304572.52315039@f26.mail.ru>

On Thu, Apr 18, 2013 at 09:02:52PM +0400, Alexander Shiyan wrote:
> > On Thu, Apr 18, 2013 at 03:06:26PM +0400, Alexander Shiyan wrote:
> > > 
> > > So. OK, I temporary patch my board and it working now.
> > > Please forget about correct memory size, it is not true.
> > > Size is incorrect. Both banks are enabled and size detected as 512M.
> > > I think this size is programmed by flash_header:
> > >   { .ptr_type = 4, .addr = 0x83fd9000, .val = 0xb2a20000, },
> > >   { .ptr_type = 4, .addr = 0x83fd9008, .val = 0xb2a20000, },
> > > 
> > > After program NAND and start from NAND, size is still wrong...
> > > So, what we can do it this case for proper operation? Disable second bank?
> > 
> > When writing the autodetection code I assumed that all boards correctly
> > setup the SDRAM controller. Appearently I was wrong.
> > 
> > I suggest disabling the second chip select since it's not used on your
> > board. However, I begin doubting that it was the right decision to
> > depend on ram size detection.
> 
> Yes, disabling second bank is helps.
> So, I repair my second board (same as first, but with real 512M of SDRAM).
> Works, but of course memory is fixed at 256M. Tomorrow I will test current
> 2013.04 on this board since probably problem appears only on 256M-version.
> Currently I think about return fixed table of memory in the board file or get
> memory size by testing memory. In both cases we need to disable ESDCTL
> module and now I do not know how make it better rather than simple remove
> this module from Makefile.

I wonder if it's possible to detect whether there actually is memory on
the seconf bank. I remember trying it (probably on some other i.MX), but
all I got was a locked up system when I tried to access non present
SDRAM.

Sascha

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