[maemo-developers] Firmware 4.2007.26-8 has inferior SDHC performance than 3.2007.10-7 - why?

From: Neil MacLeod gmane at nmacleod.com
Date: Sun Jul 8 03:48:20 EEST 2007
Daniel Stone wrote:
> The kernel has also had other changes, which IIRC include blacklisting
> some cards, so if you could list exactly which card you're using in the
> bug report, that would help.  (Some cards were believed to run okay at
> higher speeds, but would show up data corruption et al.)
I've listed that detail in the bug, also if you follow the link to Phil Langdales blog site the first comment also lists the timings I observed with several other cards (4GB SDHC Class 2 Transcend, 4GB SDHC Class 2 SanDisk, 1GB RS-MMC, 128MB SD).

The card I've tested with for the bug - 8GB SDHC Class 2 Transcend - supports high speed (48Mhz) and 4-bit wide data bus using Phils SDHC patches and I had no performance or corruption issues with this card... if this card has been blacklisted it would be nice to know for sure - sadly the official firmware doesn't output any details about the card to dmesg as did Phils patches. The information output to dmesg by Phils patch made it clear that SanDisk SDHC cards were best avoided! :)

More information about the maemo-developers mailing list