答复: SDHC driver of RTEMS

[芮正新]

Hi Ric,
  Do you found such problems on your driver?
  The u-boot has the "fatload" command, I can use it to load RTEMS image(about 4MB size) from SD card, and it's has no error.
  I know the u-boot use poll method, but it should not be the reason.

Thanks & Best regards,
Rui Zhengxin


-----邮件原件-----
发件人: Claus, Ric [mailto:claus at slac.stanford.edu] 
发送时间: 2013年8月4日 星期日 4:34
收件人: 芮正新; rtems-users at rtems.org
抄送: Huffer, Michael E.
主题: RE: SDHC driver of RTEMS

Hi,

  I've been working on such a driver and should have something ready for consideration by the RTEMS community soon.

  Ric

________________________________________
From: rtems-users-bounces at rtems.org [rtems-users-bounces at rtems.org] On Behalf Of 芮正新 [ruizx at sciyon.com]
Sent: Friday, August 02, 2013 6:41 PM
To: rtems-users at rtems.org
Subject: SDHC driver of RTEMS

Hi all,
I want to use SDHC SD card on my MPC8309SOM board.
RTEMS not include the SDHC driver, so I try to port the SDHC driver from u-boot code, but it seem to have too many problems.
When I set CONFIGURE_BDBUF_MAX_READ_AHEAD_BLOCKS >1, the driver can't work well.
The BRDA task looks like be blocked after read the number of CONFIGURE_BDBUF_BUFFER_MAX_SIZE blocks, and some seconds later, the fread function return error.
The fwrite function often failed.
I searched the web and know that P1020 also has SDHC, http://www.rtems.com/wiki/index.php/QorIQ.

Anyone can give me some help for the SDHC driver? Very thanks to you.



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