DM355 MMC/SD Driver

Paul Bartosek

Hello,

I am using the v1.10 LSP with the montavista 2.6.10 kernel and I am having trouble getting any real performance out of the MMC/SD driver, currently I am reading around 1.5MB/sec and writing 150kB/sec. I've gone through the updates from this page:

http://software-dl.ti.com/dsps/dsps_registered_sw/sdo_sb/targetcontent/psp/mv_lsp_1_10/index.html

And I can't even get the SDIO driver to work properly so I am stuck using the old MMC driver currently.

Has anyone had any experience either getting the new SDIO driver to work with a DM355 or modifying the old MMC driver to get any better performance out of it?

over 14 years ago

0 Miguel A. Alanis over 14 years ago

TI__Genius 9490 points

Paul,

The linux drivers datasheet has some performance #s for the MMC/SD driver on dm355 (section 9.3) (http://focus.ti.com/lit/an/sprs566a/sprs566a.pdf ) which are way better #s than what you are describing, so i'm not sure if EDMA was implemented to help or why you are seeing those low #s.

I'll move the post to the linux drivers forum so the right audience can get a chance to comment or provide other suggestions.

regards,

miguel

0 Sudhakar Rajashekhara over 14 years ago in reply to Miguel A. Alanis

TI__Expert 5170 points

Hi Paul,

The issue you are seeing is on MontaVista-based kernel; MontaVista normally provides bug fixes via their MVZone site which requires a yearly license subscription. Please check there.

Optionally, TI is actively fixing bugs in the GIT-tree community kernel available at http://arago-project.org/git/projects/?p=linux-davinci.git;a=shortlog;h=refs/heads/r37. See whether the issue exists in this kernel.

Regards, Sudhakar

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DM355 MMC/SD Driver