[U-Boot] [PATCH v2a] AT91: add SD/MMC support

[Schleifer, Alexander]

Hello Reinhard,

thanks for your reply.
I checked the register settings and sorted out, that the SDCBUS was initialized in 4-bit mode by the bootstrap.

So I added the explicit initialization when port A is used:

#if defined(CONFIG_ATMEL_MCI_PORTB)
        mmci_writel(SDCR, (MMCI_BF(SCDSEL, 1)
                         | MMCI_BF(SCDBUS, 0)));
#else
        mmci_writel(SDCR, (MMCI_BF(SCDSEL, 0)
                         | MMCI_BF(SCDBUS, 0)));
#endif

Best regards,
Alex

-----Original Message-----
From: Reinhard Meyer [mailto:u-boot at emk-elektronik.de] 
Sent: Montag, 16. August 2010 12:16
To: Schleifer, Alexander
Cc: u-boot at lists.denx.de
Subject: Re: [U-Boot] [PATCH v2a] AT91: add SD/MMC support

Dear Schleifer, Alexander,
> But I found out, that the AT91Bootstrap initialization impacts

the U-Boot code. If I use the AT91Bootstrap (without mci initialization)

from NAND flash, the mmc init command successfully reads the card.

It fails if I use the AT91Bootstrap with mci initialization.

That's unlikely (it has the same init sequences)...

Do you have at91_mci_hw_init(void) in your at91samXXXX_devices.c and do you call that function from your board init?

Can you list me what that bootstrap does initialize differently if mci is enabled?

Best Regards,
Reinhard