On 03/14/2017 01:44 PM, Stephen Warren wrote: > On 03/13/2017 07:08 PM, Sergey Kubushyn wrote: >> On Mon, 13 Mar 2017, Stephen Warren wrote: >> >>> On 03/13/2017 03:34 PM, Tim Harvey wrote: >>>> Greetings, >>>> >>>> I'm working with some boards with eMMC FLASH and understand that I can >>>> set the fields of the PARTITION_CONFIG with the 'mmc partconf' command >>>> to specify what partition is used for boot. Once I do that to set the >>>> boot0 partition for example, how can I access that partition from >>>> within u-boot via mmc read/write? In Linux the kernel provides access >>>> to user/boot0/boot1/rpmb via different devices, but I don't see u-boot >>>> doing that. >>> >>> The "mmc dev" command can be used to select which MMC device to >>> operate on. The "typical" command "mmc dev 0" selects the main >>> partition on MMC device 0 for later MMC-specific commands such as "mmc >>> read". You can add an extra parameter to that command to request a >>> specific HW partition, e.g. "mmc dev 0 1" selects boo0 of MMC device 0 >>> and "mmc dev 0 2" selects boot1. >>> >>> A similar naming scheme exists for commands that take a complete >>> device specification each time. For example, "part list mmc 0" to list >>> partitions in the main partition on MMC device 0, or "part list mmc >>> 0.1" to list partitions on boot0 of MMC device 0. >> >> Unfortunately this has absolutely nothing to do with eMMC _BOOT_ >> partitions... > > That's incorrect. See my other reply for details.
Yes, Stephen's comment is right. > >> There 2 of those on eMMC and they are _NOT_ accessible in >> this fashion. Neither they bear any FS on them. > > The boot HW partitions are block storage just like any other. SW can place > whatever data structures it wants into these HW partitions; the > interpretation of any data stored here is up to the SW or HW that reads and > interprets it, e.g. a SoC boot ROM. While many systems will place raw data > here, others certainly do place SW partition tables, and perhaps even > filesystems, in the HW partitions. Also, agreed. > > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > https://lists.denx.de/listinfo/u-boot _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
