19.02.2020 19:27, Christoph Hellwig пишет: > On Wed, Feb 19, 2020 at 07:23:39PM +0300, Dmitry Osipenko wrote: >> The gpt_sector=<sector> causes the GPT partition search to look at the >> specified sector for a valid GPT header if the GPT is not found at the >> beginning or the end of block device. >> >> In particular this is needed for NVIDIA Tegra consumer-grade Android >> devices in order to make them usable with the upstream kernel because >> these devices use a proprietary / closed-source partition table format >> for the EMMC and it's impossible to change the partition's format. Luckily >> there is a GPT table in addition to the proprietary table, which is placed >> in uncommon location of the EMMC storage and bootloader passes the >> location to kernel using "gpt gpt_sector=<sector>" cmdline parameters. >> >> This patch is based on the original work done by Colin Cross for the >> downstream Android kernel. > > I don't think a magic command line is the way to go. The best would be > to reverse-engineer the proprietary partition table format. If that is > too hard we can at least key off the odd GPT location based of it's > magic number. I'll try to take a look at RE, pretty sure somebody tried to do that before.
