On 28 of September 2010 14:00:43 dylan cristiani wrote: > Hi sirs, here is my scenario: kernel 2.6.36-rc4; cpu pxa270; platform > is an enhancement (i like to see things that way...) and customisation > of the mainstone III board; here comes the (my) problem: if i boot with > my standard kernel boot command line (to boot from system flash): > 'root=/dev/mtdblock2 rootfstype=jffs2 mem=64M console=ttyS0,115200n8' > > i can get the rootfs up, and the SD card is up too, and correctly > working; here's the relevant kernel log: > > .... > XScale iWMMXt coprocessor detected. > rtc-ds1307 0-0068: setting system clock to 2010-09-28 03:03:08 UTC > (1285642988) > pxa27x-udc pxa27x-udc: USB reset > mmc0: new SD card at address aaaa > mmcblk0: mmc0:aaaa SD02G 1.84 GiB > mmcblk0: p1 > pxa27x-udc pxa27x-udc: USB reset > ..... > > then the rootfs coems up properly. > > Else, if i try to boot the rootfs directly form the SD card, with > kernel boot command line: > 'root=/dev/mmcblk0p1 rootfstype=ext2 mem=64M console=ttyS0,115200n8' > > the rootfs doen't work, and i can see some problems around with usb > client gadget; here's the relevant kernel log: > > .... > XScale iWMMXt coprocessor detected. > rtc-ds1307 0-0068: setting system clock to 2010-09-28 03:03:43 UTC > (1285643023) > VFS: Cannot open root device "mmcblk0p1" or unknown-block(0,0) > Please append a correct "root=" boot option; here are the available > partitions: > 1f00 256 mtdblock0 (driver?) > 1f01 2048 mtdblock1 (driver?) > 1f02 63232 mtdblock2 (driver?) > Kernel panic - not syncing: VFS: Unable to mount root fs on > unknown-block(0,0) > Backtrace: > [] (dump_backtrace+0x0/0x118) from [] (dump_stack+0x18/0x1c) > r6:00008000 r5:c3813000 r4:c0417b70 r3:c03f5714 > [] (dump_stack+0x0/0x1c) from [] (panic+0x60/0x18c) > [] (panic+0x0/0x18c) from [] (mount_block_root+0x25c/0x2ac) > pxa27x-udc pxa27x-udc: ep0:handle_ep0: state=WAIT_FOR_SETUP, > req=(null), udccsr0=0x2c1, udcbcr=8, irq_msk=1 > pxa27x-udc pxa27x-udc: ep0:set_ep0state: > state=WAIT_FOR_SETUP->SETUP_STAGE, udccsr0=0x2c1, udcbcr=8 > pxa27x-udc pxa27x-udc: ep0:handle_ep0_ctrl_req: SETUP 80.06 v0100 > i0000 l0040 > pxa27x-udc pxa27x-udc: ep0:set_ep0state: > state=SETUP_STAGE->IN_DATA_STAGE, udccsr0=0x281, udcbcr=0 > pxa27x-udc pxa27x-udc: ep0:pxa_ep_queue: queue req > c393dbc0(first=yes), len 18 buf c386d000 > pxa27x-udc pxa27x-udc: ep0:write_ep0_fifo: in 16 bytes, 2 left, > req=c393dbc0, udccsr0=0x202 > pxa27x-udc pxa27x-udc: USB reset > pxa27x-udc pxa27x-udc: USB reset start > pxa27x-udc pxa27x-udc: ep0:req_done: complete req c393dbc0 stat -71 > len 16/18 > g_ether gadget: setup complete --> -71, 16/18 > pxa27x-udc pxa27x-udc: ep0:set_ep0state: > state=IN_DATA_STAGE->WAIT_FOR_SETUP, udccsr0=0x200, udcbcr=0 > pxa27x-udc pxa27x-udc: ep0:handle_ep0: state=WAIT_FOR_SETUP, > req=(null), udccsr0=0x200, udcbcr=0, irq_msk=1 > r3:00000001 r2:20000013 r1:c3825f60 r0:c039601b > [] (mount_block_root+0x0/0x2ac) from [] (mount_root+0x54/0x6c) > r8:00000000 r7:00000013 r6:c0051e48 r5:00000000 r4:c039607f > [] (mount_root+0x0/0x6c) from [] (prepare_namespace+0x12c/0x184) > r5:c00203c1 r4:c00203ac > [] (prepare_namespace+0x0/0x184) from [] (kernel_init+0x114/0x154) > r5:c00083d4 r4:c0416e60 > [] (kernel_init+0x0/0x154) from [] (do_exit+0x0/0x5dc) > r4:00000000 r3:00000000 > .... > > last months i ported my system form ancient 2.6.18 kernel to my current > kernel (2.6.36-rc4), but i remember that with 2.6.18 the rootfs's > booting from SD did work; so i re-loaded 2.6.18 zImage, and in fact the > SD roots booting worked properly; then i investigated a bit and i have > found that also with 2.6.19 it worked, while with 2.6.20 it stopped > working (i didn't try between 2.6.20 and 2.6.36-rc4 but if it's helpful > i can do it). > The only way to solve my problem was to 'patch' the file > drivers/Makefile, moving the mmc.o object file upward; here is a sort of > 'patch', but i regret in advance for some 'possible' (i had to write > 'sure', but i like to be modest person....) syntax mistake, but i'm not > in habbit with patches...: > > --- a/drivers/Makefile > +++ b/drivers/Makefile > @@ -44,7 +44,8 @@ > obj-y += macintosh/ > obj-$(CONFIG_IDE) += ide/ > obj-$(CONFIG_SCSI) += scsi/ > obj-$(CONFIG_ATA) += ata/ > obj-$(CONFIG_MTD) += mtd/ > obj-$(CONFIG_SPI) += spi/ > +obj-$(CONFIG_MMC) += mmc/ > obj-y += net/ > @@ -92,9 +93,8 @@ > obj-y += lguest/ > obj-$(CONFIG_CPU_FREQ) += cpufreq/ > obj-$(CONFIG_CPU_IDLE) += cpuidle/ > -obj-$(CONFIG_MMC) += mmc/ > obj-$(CONFIG_MEMSTICK) += memstick/ > obj-$(CONFIG_NEW_LEDS) += leds/ > obj-$(CONFIG_INFINIBAND) += infiniband/ > obj-$(CONFIG_SGI_SN) += sn/ > obj-y += firmware/ > > stated that it's not clear to me why when i don't try to boot the > rootfs directly from the SD, its driver comes up in the right way, and > the SD works, while when i try to boot the rootfs from the SD i cannot > get things to work (maybe the device is not up yet when the VFS > tryies to come up in fact in such a situation i cannot read any log > about mmc0 device!), i was wondering if this patch could be fair or > maybe (probably) i'm missing some potential side effects??? > any hint will be appreciated!!! > thanks and bye > > - > > dylan cristiani > > -- > Fortunately Iâve been adhering to a pretty strict, uh, drug regimen to > keep my mind, you know, uh, limber... > --- It seems you're missing rootdelay=[0-9]+ argument to kernel -- 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
