All of lore.kernel.org
 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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.