lkml.org 
[lkml]   [2010]   [Jun]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    SubjectRe: [Uclinux-dist-devel] [PATCH 1/2] mtd: m25p80: Reworkprobing/JEDEC code
    On Mon, Jun 21, 2010 at 07:20, Anton Vorontsov wrote:
    > You can't easily change OF. It's like "let's change ACPI tables
    > or BIOS in these PCs". Doable, but involves things like reflashing.
    > And we usually have to support old BIOSes as well.
    >
    > OTOH, I see (git grep m25p arch/powerpc/boot/dts/) that in
    > mainline kernel only MPC8569 board has a correct m25p
    > node, and it is STMicro variant (it is JEDEC capable).
    >
    > As we don't really have to support out of tree code, I'd
    > just go with this patch, assuming that we have to change
    > device tree for boards with non-JEDEC flashes. It's
    > effectively the same thing as platform data flag, except
    > that it works automatically for OF platforms.
    >
    > diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
    > index 81e49a9..a610ca9 100644
    > --- a/drivers/mtd/devices/m25p80.c
    > +++ b/drivers/mtd/devices/m25p80.c
    > @@ -680,6 +680,16 @@ static const struct spi_device_id m25p_ids[] = {
    >        { "m25p64",  INFO(0x202017,  0,  64 * 1024, 128, 0) },
    >        { "m25p128", INFO(0x202018,  0, 256 * 1024,  64, 0) },
    >
    > +       { "m25p05-nonjedec",  INFO(0, 0,  32 * 1024,   2, 0) },
    > +       { "m25p10-nonjedec",  INFO(0, 0,  32 * 1024,   4, 0) },
    > +       { "m25p20-nonjedec",  INFO(0, 0,  64 * 1024,   4, 0) },
    > +       { "m25p40-nonjedec",  INFO(0, 0,  64 * 1024,   8, 0) },
    > +       { "m25p80-nonjedec",  INFO(0, 0,  64 * 1024,  16, 0) },
    > +       { "m25p16-nonjedec",  INFO(0, 0,  64 * 1024,  32, 0) },
    > +       { "m25p32-nonjedec",  INFO(0, 0,  64 * 1024,  64, 0) },
    > +       { "m25p64-nonjedec",  INFO(0, 0,  64 * 1024, 128, 0) },
    > +       { "m25p128-nonjedec", INFO(0, 0, 256 * 1024,  64, 0) },
    > +

    are you picking the m25p because its flash geometry matches whatever
    you're using, or because you have some weird variant of the m25p that
    has JEDEC commands removed ?
    -mike
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2010-06-21 18:37    [W:0.028 / U:0.800 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site