Adiran, snip for mmc_debug below I will forward to you under full logs. Philip Without mod the following error occurs ============================== mmc1: req done (CMD6): 0: 00000900 00000000 00000000 00000000 mmc1: clock 48000000Hz busmode 2 powermode 2 cs 0 Vdd 7 width 3 timing 1 pxa-sdh [platform_set_8_bit()]: EXIT: mmc1 SD_CE_ATA_2 = 1100 mmc1: new high speed MMC card at address 0001 mmc1: starting CMD16 arg 00000200 flags 00000095 pxa-sdh [platform_specific_card_detect()]: EXIT: mmc1 card_detect_ok = 0000 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000001 mmc1: req done (CMD16): 0: 00000900 00000000 00000000 00000000 mmcblk0: mmc1:0001 M2G1DD 1.90 GiB mmcblk0:<7>mmc1: starting CMD18 arg 00000000 flags 000000b5 mmc1: blksz 512 blocks 8 flags 00000200 tsac 150 ms nsac 1000 mmc1: CMD12 arg 00000000 flags 0000049d pxa-sdh [platform_specific_card_detect()]: EXIT: mmc1 card_detect_ok = 0000 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000001 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000002 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000001 mmc1: req done (CMD18): 0: 00000900 00000000 00000000 00000000 mmc1: 4096 bytes transferred: 0 mmc1: (CMD12): 0: 00000b00 00000000 00000000 00000000 unknown partition table with the patch =========== mmc1: req done (CMD6): 0: 00000900 00000000 00000000 00000000 mmc1: clock 48000000Hz busmode 2 powermode 2 cs 0 Vdd 7 width 3 timing 1 pxa-sdh [platform_set_8_bit()]: EXIT: mmc1 SD_CE_ATA_2 = 1100 mmc1: new high speed MMC card at address 0001 mmc1: starting CMD16 arg 00000200 flags 00000095 pxa-sdh [platform_specific_card_detect()]: EXIT: mmc1 card_detect_ok = 0000 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000001 mmc1: req done (CMD16): 0: 00000900 00000000 00000000 00000000 mmcblk0: mmc1:0001 M2G1DD 1.90 GiB mmcblk0:<7>mmc1: starting CMD18 arg 00000000 flags 000000b5 mmc1: blksz 512 blocks 8 flags 00000200 tsac 150 ms nsac 1000 mmc1: CMD12 arg 00000000 flags 0000049d pxa-sdh [platform_specific_card_detect()]: EXIT: mmc1 card_detect_ok = 0000 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000001 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000002 pxa-sdh [sdhci_irq()]: *** mmc1 got interrupt: 0x00000001 mmc1: req done (CMD18): 0: 00000900 00000000 00000000 00000000 mmc1: 4096 bytes transferred: 0 mmc1: (CMD12): 0: 00000b00 00000000 00000000 00000000 p1 p2 p3 p4 On Mar 15, 2010, at 1:08 AM, Adrian Hunter wrote: > Philip Rakity wrote: >> Some eMMC chips have a boot partition that is meant to be used to load in low level boot code. >> This partition is available when the chip is powered up. Normally the boot loader would disable >> access to the partition once boot code was loaded in before passing control to linux. >> >> if booting occurs from another device (not the eMMC chip) the partition will not be disabled by >> the boot loader and control will be passed to linux. This will cause linux to not recognize user >> partitions on the chip unless access to the boot partition is deactivated. >> >> See JEDEC Standard 84-A44 (eMMC 4.4 spec) -- Page 139 > > Page 139 doesn't say anything about why you need that switch command. > Please provide a more useful reference or delete this. > > Boot mode is terminated by CMD1, so that switch command should not > be needed. Please explain why it is needed in more detail. > > That switch command should not be used for devices that do not > support it e.g. eMMC 4.3 and before. > > >> >> signed off by: Philip Rakity <prakity@xxxxxxxxxxx> >> diff -ru linux-2.6.32.8/drivers/mmc/core/mmc.c linux-2.6.32.8 copy/drivers/mmc/core/mmc.c >> --- linux-2.6.32.8/drivers/mmc/core/mmc.c 2010-02-09 04:57:19.000000000 -0800 >> +++ linux-2.6.32.8 copy/drivers/mmc/core/mmc.c 2010-03-12 20:56:16.000000000 -0800 >> @@ -430,6 +432,13 @@ >> } >> >> /* >> + * ensure eMMC private booting PARTITION is not enabled >> + * see JEDEC Standard No. 84-A44 - Page 139 >> + */ >> + mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, >> + EXT_CSD_BOOT_CONFIG, 0x0); >> + >> + /* >> * Compute bus speed. >> */ >> max_dtr = (unsigned int)-1; >> diff -ru linux-2.6.32.8/include/linux/mmc/mmc.h linux-2.6.32.8 copy/include/linux/mmc/mmc.h >> --- linux-2.6.32.8/include/linux/mmc/mmc.h 2010-02-09 04:57:19.000000000 -0800 >> +++ linux-2.6.32.8 copy/include/linux/mmc/mmc.h 2010-03-12 20:53:48.000000000 -0800 >> @@ -251,6 +252,7 @@ >> * EXT_CSD fields >> */ >> >> +#define EXT_CSD_BOOT_CONFIG 179 /* R/W */ >> #define EXT_CSD_BUS_WIDTH 183 /* R/W */ >> #define EXT_CSD_HS_TIMING 185 /* R/W */ >> #define EXT_CSD_CARD_TYPE 196 /* RO */ >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
