On Wednesday 18 September 2013 02:32 AM, Kevyn-Alexandre Paré wrote:
Hi, My question is related to the drivers/mmc/host/omap_hsmmc.c host controller compatibility with SDXC for the OMAP35x? Reading the TRM for OMAP35x: http://www.ti.com/lit/ug/spruf98x/spruf98x.pdf It's said that: - Full compliance with SD command/response sets as defined in the SD Memory Card Specifications, v2.0 including high-capacity SDHC cards up to 32GB. - Full compliance with sets as defined in the SD Card Specification, Part A2, SD Host Controller Standard Specification, v2.00 It doesn't mention the SDXC? I'm trying to found my way through all the spec of sdcard.org. I'm still wondering why using SDXC of 64GB is working and doesn't pop a WARNING message and if it's safe?? My test shows that I'm having some timeout in some cases (v3.4.60): omap_hsmmc omap_hsmmc.0: IRQ Status is 18000 omap_hsmmc omap_hsmmc.0: MMC IRQ 0x18000 : ERRI CTO mmc0: req done (CMD52): -110: 00000000 00000000 00000000 00000000 mmc0: starting CMD52 arg 80000c08 flags 00000195 omap_hsmmc omap_hsmmc.0: mmc0: CMD5, argument 0x00000000 omap_hsmmc omap_hsmmc.0: IRQ Status is 18000 omap_hsmmc omap_hsmmc.0: MMC IRQ 0x18000 : ERRI CTO mmc0: req failed (CMD5): -110, retrying... mmc1: starting CMD8 arg 000001aa flags 000002f5 omap_hsmmc omap_hsmmc.1: mmc1: CMD8, argument 0x000001aa mmc0: starting CMD18 arg 00020000 flags 000000b5 omap_hsmmc omap_hsmmc.1: IRQ Status is 18000 omap_hsmmc omap_hsmmc.1: MMC IRQ 0x18000 : ERRI CTO mmc1: req done (CMD8): -110: 00000000 00000000 00000000 00000000 So CMD 52,5 and 8 gives me timeout...
For SD cards, these cmd's are expected to timeout during card initialization.
Looking at the 3.11.1 there is 2 more validation for UHS that are not in 3.4.60: omap_hsmmc_set_clock // Enable High-Speed Support omap_set_bus_width
Those changes are not for SD3.0 speed modes
Is it safe to use SDXC with OMAP35x or not? Should this pop a error message?
SDXC cards should work albeit at High Speed mode (as in SD2.0). Refer to [1] for card size Vs speed mode/SD spec version. Can you check if the filesystem type on SDXC card is supported by the system software running on OMAP35x. [1] https://www.sdcard.org/consumers/speed/bus_speed/
Best Regards, -KA -- 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
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