public inbox for u-boot@lists.denx.de
 help / color / mirror / Atom feed
From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] i.MX28: Lower the amount of blocks transfered in one DMA cycle
Date: Mon, 9 Apr 2012 21:02:15 +0200	[thread overview]
Message-ID: <201204092102.15643.marex@denx.de> (raw)
In-Reply-To: <CAOMZO5CZATfBn7NCThteEwJau4gvrZ=DQA+yBnhbS5E5vFCUPw@mail.gmail.com>

Dear Fabio Estevam,

> Hi Marek,
> 
> On 4/9/12, Marek Vasut <marex@denx.de> wrote:
> > Some MMC cards, like my ancient 32.0MB SanDisk RS-MMC cards had issue if
> > b_max
> > was set to 0x40 and DMA was enabled. Lower this value to 0x20, which
> > allows these cards to work too.
> 
> I know this is off topic here, but I am wondering whether the mxs mmc
> driver in the kernel is able to handle this card correctly or not.

Linux does, but I think there must be some limit to multiblock transfers there, 
otherwise it'd fail too.

> Regards,
> 
> Fabio Estevam

Best regards,
Marek Vasut

      reply	other threads:[~2012-04-09 19:02 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-09  4:50 [U-Boot] [PATCH] i.MX28: Lower the amount of blocks transfered in one DMA cycle Marek Vasut
2012-04-09 13:06 ` Fabio Estevam
2012-04-09 19:02   ` Marek Vasut [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=201204092102.15643.marex@denx.de \
    --to=marex@denx.de \
    --cc=u-boot@lists.denx.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox