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High Speed SD/MMC kernel for Maemo 4.1 (Diablo)

I finally got some time to update my development tree to the new Diablo code and built a new kernel with my high-speed SD/MMC patch. Additionally, it will speed up access to the internal 2GB flash (eMMC) in the n810. For those with long memories, the Maemo bug which slows down card access when the CPU is idle is still present although there has been a little bit of activity on the Nokia side recently (They have an internal bug open for it now)

You can find my custom kernel, patches and instructions here.

{ 5 } Comments

  1. Urho Konttori | 10th July 2008 at 03:14 | Permalink

    Hey, great that you made it available for all of us. It would be great if you could post a few benchmarks for the speed difference. Also to detail a bit on the performance bug. I wonder how big difference the greater speed makes for the vmem situations.

  2. Philip Langdale | 10th July 2008 at 07:09 | Permalink

    I wrote about the performance bug here: http://intr.overt.org/blog/?p=66

    As for performance, it will depend on the cards you use, but for a typical high speed card, you can expect it to be almost twice as fast (we’re doubling the bus speed from 24 to 48 MHz)

    For non-high-speed cards, there will obviously be no difference.

  3. kkw | 12th July 2008 at 22:53 | Permalink

    anyone know of a n00b guide to kernal flashing? i need baby steps. . .

  4. Philip Langdale | 13th July 2008 at 08:30 | Permalink

    The page I linked to from the README tells you how to do a kernel-only flash but the general flashing instructions are here:

    http://maemo.org/community/wiki/howto_flashlatestnokiaimagewithlinux/

    It appears that Diablo includes (or will eventually include) a tool to flash the kernel from the tablet itself. I haven’t seen this documented yet.

  5. Cyberboy | 20th March 2009 at 06:51 | Permalink

    I waiting for the newer patch for Diablo 5.2008.43-7

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