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From: Dirk Behme <dirk.behme@googlemail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] i.MX dcache issues
Date: Sun, 15 Jul 2012 08:56:35 +0200	[thread overview]
Message-ID: <500269A3.60105@googlemail.com> (raw)
In-Reply-To: <386549548.1363378.1342303697853.JavaMail.root@advansee.com>

On 15.07.2012 00:08, Beno?t Th?baudeau wrote:
> On Sat, Jul 14, 2012 at 11:28:03PM +0200, Beno?t Th?baudeau wrote:
>> Shouldn't the MMC/eSDHC drivers flush/invalidate the dcache ranges
>> that they use
>> for DMA operations? Not doing so would explain why stack-allocated
>> buffers are
>> more affected than buffers in unused RAM areas.
>
> That will help:
> http://git.denx.de/?p=u-boot/u-boot-mmc.git;a=commitdiff;h=e576bd90f940806b989ffd666552081f17f032c8

Are you sure that this patch does really help?

If I remember correctly (will re-check) we have this patch locally 
applied. But even with this patch, we have issues so that we enabled 
CONFIG_SYS_DCACHE_OFF, i.e. disabled the dcache.

The issues we observed *without* CONFIG_SYS_DCACHE_OFF: The SD card 
was detected as 1-bit only (mmcinfo), while with dcache off it was 
used as 4-bit. Debugging this showed that wrong configuration data was 
read [1]. Having a fat partition on the card, mmc part/fatls etc 
failed, too, with cache enabled.

Best regards

Dirk

[1]

http://git.denx.de/?p=u-boot.git;a=blob;f=drivers/mmc/mmc.c;h=aebe578ff6f2e0228baa3e5d010f6808ea269760;hb=HEAD#l856

mmc->scr[0]/scr[1] contained random data

  reply	other threads:[~2012-07-15  6:56 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1294453568.1339613.1342208396619.JavaMail.root@advansee.com>
2012-07-14 21:28 ` [U-Boot] i.MX dcache issues Benoît Thébaudeau
2012-07-14 22:08   ` Benoît Thébaudeau
2012-07-15  6:56     ` Dirk Behme [this message]
2012-07-15 14:37       ` Benoît Thébaudeau
2012-07-16 22:30       ` Marek Vasut
2012-07-19 11:43         ` Benoît Thébaudeau
2012-07-19 11:43           ` Marek Vasut
2012-07-19 12:43           ` Stefano Babic
2012-07-19 12:47             ` Marek Vasut
2012-07-15 13:46     ` Stefano Babic
2012-07-15 13:45   ` Stefano Babic
2012-07-15 14:45     ` Benoît Thébaudeau
2012-07-16  6:13       ` Dirk Behme

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