SD卡调试出现错误

SD卡调试出现错误

我们用的是S3C6410，做了一个底板，跟开发板硬件上的区别在于没有把写保护SD0_nWP连接到XhiDATA16/EINT21/GPL13脚上，就是说SD0_nWP是悬空的。
现在调试SD卡出现以下打印信息，不知道是不是这个写保护信号脚SD0_nWP没接的原因还是别的原因，很急，请高手指点，谢谢
mmc0: Timeout waiting for hardware interrupt.
mmc0: mmc_rescan_try_freq: trying to init card at 300000 Hz
*************************************************
mmc0: error -110 whilst initialising SD card
mmc0: Timeout waiting for hardware interrupt.
mmc0: mmc_rescan_try_freq: trying to init card at 200000 Hz
*************************************************
mmc0: error -110 whilst initialising SD card
mmc0: Timeout waiting for hardware interrupt.
mmc0: mmc_rescan_try_freq: trying to init card at 100000 Hz
*************************************************
mmc0: error -110 whilst initialising SD card
mmc0: Timeout waiting for hardware interrupt.
mmc1: mmc_rescan_try_freq: trying to init card at 400000 Hz
mmc1: mmc_rescan_try_freq: trying to init card at 300000 Hz
mmc1: mmc_rescan_try_freq: trying to init card at 200000 Hz
mmc1: mmc_rescan_try_freq: trying to init card at 100000 Hz

写保护没连接的话挂载的时候应该是只读的，与这个没关系，这个脸通信都有问题，估计时钟线没走好，有干扰

embedsky_lhh 发表于 2012-8-8 18:08
写保护没连接的话挂载的时候应该是只读的，与这个没关系，这个脸通信都有问题，估计时钟线没走好，有干扰

您好，我测了一下clk信号，信号蛮好的，我试了一下把上拉电阻改小，插入SD卡（256MB）出现以下打印信息：
mmc0: new high speed SD card at address b368
mmcblk0: mmc0:b368 SD    244 MiB
mmcblk0: retrying using single block read
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 0
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 1
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 2
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 3
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 4
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 5
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 6
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 7
Buffer I/O error on device mmcblk0, logical block 0
mmcblk0: retrying using single block read
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 0
mmc0: ADMA error
mmc0: Got data interrupt 0x00400000 even though no data operation was in progress.
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
mmcblk0: error -5 transferring data, sector 1, nr 7, card status 0x0
end_request: I/O error, dev mmcblk0, sector 1
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 2
mmc0: Got data interrupt 0x02000000 even though no data operation was in progress.
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 3
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 4
mmc0: Got data interrupt 0x02000000 even though no data operation was in progress.
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 5
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
end_request: I/O error, dev mmcblk0, sector 6
mmc0: ADMA error
mmc0: Got data interrupt 0x00400000 even though no data operation was in progress.
mmcblk0: error -110 sending status command
mmcblk0: error -110 sending read/write command, response 0x0, card status 0x0
mmcblk0: error -5 transferring data, sector 7, nr 1, card status 0x0
end_request: I/O error, dev mmcblk0, sector 7
Buffer I/O error on device mmcblk0, logical block 0
mmcblk0: unable to read partition table

拔出SD卡
mmc0: card b368 removed

上面还有错误，不知道是什么原因，请指点

这个应该是走线的问题，你在时钟线上和地直接接个电容试试

embedsky_lhh 发表于 2012-8-10 09:18
这个应该是走线的问题，你在时钟线上和地直接接个电容试试

现在我们测得SD卡CLK信号频率是33MHz，高电平才2.0V左右，没有3.3V左右，插拔SD卡时，有时候检测正确，但大部分时间会出现错误。查看了一下S3C6410的datasheet,SD卡的CLK信号和SD数据DO~D3的供电电压是不是由S3C6410设定的datasheet里面有一个Power Control register寄存器，可以设定SD总线的供电电压。是不是这个原因，程序里面检测的SD卡供电状态时候，误认为只有3V或者更低的电压，所以6410就根据这个值，把SD卡总线电压设置为1.8V或者3V，使得SD卡输出的CLK信号电平偏低这么多？请指教，谢谢

加个上拉试试

embedsky_lhh 发表于 2012-8-12 00:52
加个上拉试试

都有上拉电阻的，而且阻值变小，效果不大