Congratulations! It will be great to have MMC v4.x support in U-Boot.
The following segment of code from
linux-2.6.25-rc9/drivers/mmc/host/at91_mci.c is confusing:
if (host->board->wire4) {
if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
mmc->caps |= MMC_CAP_4_BIT_DATA;
else
dev_warn(&pdev->dev, "4 wire bus mode not supported"
" - using 1 wire\n");
}
This code seems to imply that MMC 4 bits works on the AT91SAM9260 and
AT91SAM9263, but not any of the others in this processor family,
possibly due to a hardware bug. Any comments on why the Linux AT91 MCI
driver doesn't support an 4 bit MMC bus for all AT91SAM9 processors?
I mention this because it may impact the AT91 MCI U-Boot device driver.
Sincerely,
Ken Fuchs
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf
> Of Andy Fleming
> Sent: Tuesday, April 15, 2008 14:25
> To: Pierre Savary
> Cc: u-boot-users@lists.sourceforge.net; [EMAIL PROTECTED]
> Subject: Re: [U-Boot-Users] drivers MMCplus for at91sam9x
>
>
> On Tue, Apr 15, 2008 at 5:18 AM, Pierre Savary
> <[EMAIL PROTECTED]> wrote:
> > Then my MMC 4GB works with my Linux kernel but if I can't
> load my kernel
> > (located on the first part of this MMC) ... it's not
> really interesting :(
> >
> > So, somebody does already use MMC v4 with U-boot???
>
> I've got one that works. However, I don't have a 4GB MMC card with
> v4. I thought I did, but it turned out the card just takes advantage
> of the fact that older versions can address 4GB, even though the spec
> says 2GB is the max.
>
> However, I'm fairly confident in the code (it's been tested in
> simulated environments, and reflects what the Linux code does). I'm
> currently working on bringing it forward to the top of tree (I started
> it before drivers/ got rearranged). I'm actually hoping to generalize
> it some so we can share it between all MMC/SD users.
>
> Andy
>
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