Hello, I'm playing with mmc/sd card on a custom board with at91sam9g20 processor. U-boot v2011.3 now runs well as I added support for AT45DB041 dataflash, which is used on my board. It's size is only 512kB so I need sd card for Linux image and rootfs. Unfortunately I still can't get mmc/sd suport working. I have a micro sd (not hc) card connected to a MCI interface port A. It seems that it is correctly detected and initialized,
U-Boot> mmcinfo mci: bus_hz is 132096000, setting clock 150000 Hz, block size 512 mci: setting clock 258000 Hz, block size 512 mci: bus_hz is 132096000, setting clock 0 Hz, block size 512 mci: setting clock 258000 Hz, block size 512 mci: bus_hz is 132096000, setting clock 258000 Hz, block size 512 mci: setting clock 258000 Hz, block size 512 Device: mci Manufacturer ID: 3 OEM: 5344 Name: SU02G Tran Speed: 25000000 Rd Block Len: 512 SD version 2.0 High Capacity: No Capacity: 1977614336 Bus Width: 4-bit
U-Boot> fatinfo mmc 0 Interface: MMC Device 0: Vendor: Man 035344 Snr 413f90a9 Rev: 8.0 Prod: SU02G Type: Removable Hard Disk Capacity: 1886.0 MB = 1.8 GB (3862528 x 512) Partition 1: Filesystem: FAT16 " "
but there is some problem with block reading. When I try to read 1 block using eg. mmc read 0 0xaddr 0 1 it works and correct data are returned, but when reading more blocks U-Boot> mmc read 0 0xaddr 0 3, U-Boot> mmc read 0 0x20000000 5 3
MMC read: dev # 0, block # 5, count 3 ... mci: bus_hz is 132096000, setting clock 150002 mci: setting clock 258000 Hz, block size 512 mci: bus_hz is 132096000, setting clock 25000000 Hz, block size 512 mci: setting clock 22016000 Hz, block size 512 mci: bus_hz is 132096000, setting clock 258000 Hz, block size 512 mci: setting clock 258000 Hz, block size 512
gen_atmel_mci: CMDR 000d1052 (18) ARGR 00000a00 (SR: 0000c0d7) XFER DTIP never unset, ignoring.
the read function returns still the same data from the starting block (as I see from debug info) and it hangs then on polling while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY))); in gen-atmel-mci.c.
I have tried to search the source of problem, but I was not successful yet. I'm not very familiar with u-boot code so I can be missing something obvious. Does please someone has any solution?
Here is my config regarding mmc /* SD/MMC card */ #define CONFIG_MMC 1 #define CONFIG_GENERIC_MMC 1 #define CONFIG_GENERIC_ATMEL_MCI 1 #define CONFIG_ATMEL_MCI_PORTA 1 #define CONFIG_CMD_MMC 1
The same situation is on at91sam9260ek board, except that the card is on MCI port B. Reinhard Meyer stated that he has mmc working on this board...
best regards Jan