On Thu, Feb 16, 2023 at 06:19:11PM +0100, Heinrich Schuchardt wrote: > > > On 2/16/23 18:01, Tom Rini wrote: > > On Thu, Feb 16, 2023 at 04:29:56PM +0100, Heinrich Schuchardt wrote: > > > > > Some boards provide main U-Boot as a dedicated partition to SPL. > > > Currently we can define either a fixed partition number or an MBR > > > partition type to define which partition is to be used. > > > > > > Partition numbers tend to conflict with established partitioning schemes > > > of Linux distros. MBR partitioning is more and more replaced by GPT > > > partitioning. > > > > > > Allow defining a partition type GUID identifying the partition to load > > > main U-Boot from. > > > > > > Signed-off-by: Heinrich Schuchardt <[email protected]> > > [snip] > > > +config SYS_MMCSD_RAW_MODE_U_BOOT_GPT_PARTITION_TYPE > > > + string "GPT Partition Type on the MMC to load U-Boot from" > > > + depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_GPT_PARTITION_TYPE > > > + default d2f002f8-e4e7-4269-b8ac-3bb6fabeaff6 > > > > Is there a reason to use any other GUID value here? If not, just define, > > or use it directly with a comment. If there is a reason for other > > values to be used: > > Board vendors already differ in the partition GUIDs they use, e.g. > > SiFive: > SPL: 5B193300-FC78-40CD-8002-E86C45580B47 > Main U-Boot: 2E54B353-1271-4842-806F-E436D6AF6985 > > StarFive > SPL: 2E54B353-1271-4842-806F-E436D6AF6985 (sic) > > Microchip Icicle Board: > SPL: 21686148-6449-6E6F-744E-656564454649 > > Using unique IDs per board allow to create SD card images where U-Boot for > multiple boards is installed in parallel: > > The boot ROM will select the board specific SPL via a unique ID and then SPL > will use another unique ID to load the matching main U-Boot. > > I only added a default value here to provide a formatting sample.
Thanks for elaborating. It might be helpful to put something in a follow-up patch about these use cases under doc/ -- Tom
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