> -----Original Message----- > From: Adrian Hunter [mailto:adrian.hunter@xxxxxxxxx] > Sent: Monday, July 26, 2010 6:13 PM > To: Ghorai, Sukumar > Cc: linux-mmc@xxxxxxxxxxxxxxx; Andrew Morton > Subject: Re: [PATCH] mmc: add device class attribute for ext_csd > > Ghorai, Sukumar wrote: > > All, > > EXT_CSD is 512byte information (read using CMD8) for the MMC (eMMC) > device. > > And for the latest and upcoming specification, ext_csd are much relevant > then past. > > > > So please let me know your idea to add and get the same ext_csd as MMC > device attribute. This is the same way currently available for csd, cid, > src, etc. > > (# cat /sys/class/mmc_host/mmc1/mmc1\:0001/ext_csd) > > Some of the values in Extended CSD can change so storing > it could cause incorrect values to be reported. [Ghorai] I was thinking to get the original value as reference, such that we know that host is capable for maximum negotiation, like 8-bit, DDR mode, voltage, etc. 1. Is there any other way to get the original value supported by card? 2. If yes, is it worth full to do? > Note that Extended CSD is available via debugfs > e.g. for device mmc0:0001 with debugfs mounted on /sys/kernel/debug > > cat /sys/kernel/debug/mmc0/mmc0\:0001/ext_csd [Ghorai] Thanks. I got it. <<snip>> -- 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
