Messages in this thread | | | Date | Tue, 25 Apr 2006 16:00:50 +0100 | From | Russell King <> | Subject | Re: sd cards : OCR busy? |
| |
On Tue, Apr 25, 2006 at 07:41:04AM -0700, Ram wrote: > I am using Linux 2.6.15. > > I am getting OCR busy Error. The driver works on some sd cards and > does not work > on some other cards. i really cant figure out what the problem is.
It seems that your kernel is doing something different from the code I have in front of me.
> mmc_detect_change: > mmc_rescan: > __mmc_claim_host: > mmc_setup: > mmc_power_up: > MMC1: set_ios: clock 400000Hz busmode 1 powermode 1 Vdd 0.21 > mmc_delay: > MMC1: set_ios: clock 400000Hz busmode 1 powermode 2 Vdd 0.21 > mmc_delay: > mmc_idle_cards: > MMC1: set_ios: clock 400000Hz busmode 1 powermode 2 Vdd 0.21
Card inserted - okay.
> mmc_delay: > mmc_wait_for_cmd: > mmc_wait_for_req: > mmc_omap_start_command:MMC1: CMD0, argument 0x00000000 > mmc_omap_irq:MMC IRQ 0001 (CMD 0): EOC > MMC1: End request, err 0
Card told to go to idle state - okay.
> mmc_delay: > MMC1: set_ios: clock 400000Hz busmode 1 powermode 2 Vdd 0.21 > mmc_delay: > mmc_send_app_op_cond: > mmc_wait_for_app_cmd: > mmc_wait_for_req: > mmc_omap_start_command:MMC1: CMD55, argument 0x00000000, 32-bit response, > CRC > mmc_omap_irq:MMC IRQ 1001 (CMD 55): EOC OCRB > MMC1: OCR busy error, CMD55 > MMC1: Response 00000000 > MMC1: End request, err 0
Sent MMC_APP_CMD, got told "OCR busy" - this is bogus. APP_CMD does _not_ return an OCR. No idea why your OMAP host thinks it does.
Nevertheless, we have a zero response, but the card _did_ apparantly respond. So we decide APP commands aren't supported.
> mmc_setup:No MMC cards found > mmc_send_op_cond: > mmc_wait_for_cmd: > mmc_wait_for_req: > mmc_omap_start_command:MMC1: CMD1, argument 0x00000000, 32-bit response > mmc_omap_irq:MMC IRQ 1001 (CMD 1): EOC OCRB > MMC1: Response 00000000 > MMC1: End request, err 0
We send a CMD1 to probe for the OCR. Get zero back. Zero back from a card means "I don't support any voltage what so ever", so...
> mmc_select_voltage: ocr - 0 > mmc_release_host: > mmc_power_off:
We power down.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |