From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Tue, 28 Jan 2014 14:31:17 -0500 Subject: [U-Boot] eMMC boot partition booting and SMDK5250 support In-Reply-To: <20140128172502.GJ3277@bill-the-cat> References: <20140128172502.GJ3277@bill-the-cat> Message-ID: <20140128193117.GL3277@bill-the-cat> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 " - Note required for eMMC 4.2 boot method. > "mmc close " - Same > "mmc bootpart " - Used for eMMC 4.3 and later boot > sequence option 1/2 > "mmc bootbus " - 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'. -- Tom -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 836 bytes Desc: Digital signature URL: