Wolfram, Reading the MPC8536E Chip Errata I saw the SDHC_WP signal polarity is reversed to the silicon revision 1.0.
Unfortunately my prototype board is using revision 1.0. So, I asked to my hardware team workaround putting an extra inverter for the SDHC_WP signal. Now its working fine! Thanks, Moratelli Em Qua, 2011-04-06 às 14:18 -0300, Carlos Roberto Moratelli escreveu: > I will try address the issue in details. > > When I insert the SDCard, the same is detect like read-only: > > mmcblk0: mmc0:b368 NCard 966 MiB (ro) > 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 > sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 > sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x0000000a > sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 > mmc0: req done (CMD18): 0: 00000900 00000000 00000000 00000000 > mmc0: 4096 bytes transferred: 0 > mmc0: (CMD12): 0: 00000b00 00000000 00000000 00000000 > p1 > > So, I just can mount the filesystem read-only. I can read the fat32 > without problems. > > I tested your sugestion. I used sdhci,wp-inverted in my dtb. This > changed the behavior. Now the SDCard is detected without the read-only > flag: > > mmcblk0: mmc0:b368 NCard 966 MiB > 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 > sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 > sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x0000000a > sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 > mmc0: req done (CMD18): 0: 00000900 00000000 00000000 00000000 > mmc0: 4096 bytes transferred: 0 > mmc0: (CMD12): 0: 00000b00 00000000 00000000 00000000 > p1 > > And, I can mount a rw filesystem: > > #mount /dev/mmcblock1 /mnt > #cat /proc/mounts > ... > /dev/mmcblock1 /mnt vfat > rw,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro > 0 0 > ... > > So, I can copy files to the mounted SDCard. But, When I try to umount I > see the following error mensagens: > > #cp /etc/shadow /mnt > #ls /mnt > shadow > #umount /mnt > mmc0: Timeout waiting for hardware interrupt. > mmcblk0: error -110 transferring data, sector 5944, nr 1, card status > 0x900 > end_request: I/O error, dev mmcblk0, sector 5944 > mmc0: Timeout waiting for hardware interrupt. > mmcblk0: error -110 transferring data, sector 5936, nr 1, card status > 0x900 > end_request: I/O error, dev mmcblk0, sector 5936 > Buffer I/O error on device mmcblk0p1, logical block 3888 > mmc0: Timeout waiting for hardware interrupt. > mmcblk0: error -110 transferring data, sector 2049, nr 1, card status > 0x900 > end_request: I/O error, dev mmcblk0, sector 2049 > Buffer I/O error on device mmcblk0p1, logical block 1 > mmc0: Timeout waiting for hardware interrupt. > mmcblk0: error -110 transferring data, sector 2080, nr 1, card status > 0x900 > end_request: I/O error, dev mmcblk0, sector 2080 > ... > > I think I need the sdhci,wp-inverted in my dtb. But, it appears that > more something is necessary. > > Has someone faced this situation? > > Thanks by the help until here. > > Regards, > > Moratelli > > > > Em Qua, 2011-04-06 às 01:48 +0200, Wolfram Sang escreveu: > > > sdhci@2e000 { > > > compatible = "fsl,mpc8536-esdhc", "fsl,esdhc"; > > > reg = <0x2e000 0x1000>; > > > interrupts = <72 0x2>; > > > interrupt-parent = <&mpic>; > > > /* Filled in by U-Boot */ > > > clock-frequency = <0>; > > > }; > > > > Hmm, I am not too familiar with those SoCs, yet some 83xx needed > > > > sdhci,wp-inverted; > > > > here. Maybe yours, too? Would fit the symptoms. > > > > Regards, > > > > Wolfram > > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev