Jaehoon, How you think? On 29/01/14 04:31, Tom Rini wrote: > On Tue, Jan 28, 2014 at 12:25:02PM -0500, Tom Rini wrote: >> Hey guys, >> >> I've posted a patch to support the eMMC boot partitions found on the TI >> DRA7xx EVM the other day, and I've been looking at what exactly happens >> with the 'mmc open ...' and 'mmc close ...' commands the >> CONFIG_SUPPORT_EMMC_BOOT enables. I've got a few questions about how >> exactly the support works on the SMDK5250 and what your platform >> requirements are, so we can re-work the code to be a bit more generic. >> >> Why do we have it as "open" and "close" ? Is this because it's a >> version 4.2[1] style device? I'm working with 4.3-compatible (it's >> actually 4.41, but same method just larger partitions) one and that can >> be done with setting EXT_CSD[179] (BOOT_CONFIG / Boot configuration) _and_ >> EXT_CSD[177] to a specific and different value than we've hard-coded >> now. >> >> I would like to change things to be: >> "mmc open <device>" - Note required for eMMC 4.2 boot method. >> "mmc close <device>" - Same >> "mmc bootpart <device> <partition>" - Used for eMMC 4.3 and later boot >> sequence option 1/2 >> "mmc bootbus <device> <value>" - Note used in all boot sequences >> >> This would make the SMDK5250 sequence be (based on how I think it works >> today): >> mmc dev ... >> mmc open >> mmc write ... >> mmc bootpart ... >> mmc bootbus ... >> mmc close >> >> And the DRA7xx sequence be: >> mmc dev ... >> mmc write ... >> mmc bootpart ... >> mmc bootbus ... > > Oh! And I forgot the current 'bootpart' which appears to be a resize > operation would become 'bootpart-resize'. >
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