On Tue, Dec 05, 2017 at 04:56:37PM +0100, Maxime Ripard wrote: > Hi, > > Here is a set of patches that have been sitting in some variations for > quite some time now. > > This is mostly to ease the eMMC (and MMC, to some extent) flashing > using fastboot that in turn rely on GPT. > > The Allwinner SoCs need to have the SPL located right in the middle of > a traditional GPT, at 8kB. > > To deal with this, we would basically have two options: > - Use the already in-tree solution to move the partition entries to > another arbitrary offset in the MMC. > - Use a smaller number of partitions entries > > Both are non-standards, but are dealt with nicely by the regular tools > and users (at least on a Linux system). However, the first solution is > quite confusing for users (that needs to be aware where the partitions > will be), might be less flexible because not all tools will allow to > create partitions for things between the GPT main entry and the > partition entries, and might confuse tools if such a setup is > available. > > In our case, using the first solution, gdisk will for example refuse > to create a partition for the SPL. > > The second solution though seems to be well handled by all the tools, > and just feels the same, except that you end up with a smaller number > of partitions. In our case, that number is 56 partitions (16 sectors > before the SPL, 1 sector for the protective MBR, 1 sector for the GPT > header, and 4 partition entries per sector) instead of 128, which > doesn't sound very impractical either. > > The two first patches deal with that. > > We then provide a default partitionning scheme. I'd like feedback on > that one. I appreciate that having a good default in such a case, but > I'd like to have a reasonably simple layout that works good enough to > install a distro. I'm a bit short on background on what an EFI > partition is supposed to look like, and what a good size would be. I'd > really like some input on this. > > Finally, we enable fastboot flashing to be able to flash a pristine > system just by using FEL, fastboot oem format, and then fastboot flash > for the various components.
Merged. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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