OMAP3 上古怪的 SD 卡是 omap_hsmmc 驱动程序吗？

Question

由于某些原因，可以在几乎任何 Windows/Mac/Linux 机器上运行的卡无法在我们的嵌入式板上运行。更糟糕的是，我们有相同的卡可以正常工作！我查看了 omap_hsmmc 驱动程序（内核 2.6.32）并尝试了各种更改，例如降低时钟频率以启用 SPI 模式等，但没有运气。

这是一张工作卡的输出（前面的命令是相同的）：

mmc0: clock 24000000Hz busmode 2 powermode 2 cs 0 Vdd 16 width 2 timing 2
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address 59b4
mmcblk0: mmc0:59b4 SD    7.35 GiB 
 mmcblk0:
mmc0: starting CMD18 arg 00000000 flags 000000b5
mmc0:     blksz 512 blocks 8 flags 00000200 tsac 100 ms nsac 0
mmc0:     CMD12 arg 00000000 flags 0000049d
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD18, argument 0x00000000
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 1
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 2
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD12, argument 0x00000000
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 3
mmc0: req done (CMD18): 0: 00000900 00000000 00000000 00000000
mmc0:     4096 bytes transferred: 0
mmc0:     (CMD12): 0: 00000b00 00000000 00000000 00000000
 p1 p2
mmci-omap-hs mmci-omap-hs.0: mmc_fclk: disabled
mmci-omap-hs mmci-omap-hs.0: mmc_fclk: enabled
mmci-omap-hs mmci-omap-hs.0: context was not lost
mmc0: starting CMD18 arg 000234cb flags 000000b5
mmc0:     blksz 512 blocks 2 flags 00000200 tsac 100 ms nsac 0
mmc0:     CMD12 arg 00000000 flags 0000049d
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD18, argument 0x000234cb
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 1
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 2
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD12, argument 0x00000000
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 3

还有坏卡：

mmc0: clock 24000000Hz busmode 2 powermode 2 cs 0 Vdd 16 width 2 timing 2
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address 59b4
mmcblk0: mmc0:59b4 SD    7.35 GiB 
 mmcblk0:
mmc0: starting CMD18 arg 00000000 flags 000000b5
mmc0:     blksz 512 blocks 8 flags 00000200 tsac 100 ms nsac 0
mmc0:     CMD12 arg 00000000 flags 0000049d
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD18, argument 0x00000000
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 1
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 208002
mmci-omap-hs mmci-omap-hs.0: MMC IRQ 0x208002 : TC ERRI DCRC
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD12, argument 0x00000000
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 3
mmc0: req done (CMD18): 0: 00000900 00000000 00000000 00000000
mmc0:     0 bytes transferred: -84
mmc0:     (CMD12): 0: 00000b00 00000000 00000000 00000000
mmcblk0: retrying using single block read
mmc0: starting CMD17 arg 00000000 flags 000000b5
mmc0:     blksz 512 blocks 1 flags 00000200 tsac 100 ms nsac 0
mmci-omap-hs mmci-omap-hs.0: mmc0: CMD17, argument 0x00000000
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 1
mmci-omap-hs mmci-omap-hs.0: IRQ Status is 208002
mmci-omap-hs mmci-omap-hs.0: MMC IRQ 0x208002 : TC ERRI DCRC
mmc0: req done (CMD17): 0: 00000900 00000000 00000000 00000000
mmc0:     0 bytes transferred: -84

看起来多块 DMA 传输失败 (CMD18)，因此驱动程序尝试单块传输，但同样失败。

我应该看什么？如果还有什么我可以尝试使用这个驱动程序？还有“MMC IRQ 0x208002 : TC ERRI DCRC”是什么意思？

Answer 1

问题是在 4 位数据模式下连接不良。