On Tue, Jan 26, 2021 at 04:08:13PM +0100, Heinrich Schuchardt wrote:
On 26.01.21 14:56, Gary Bisson wrote:
Fixes fastboot issues when switching from mbr to gpt partition tables.
Signed-off-by: Gary Bisson gary.bisson@boundarydevices.com
Hi,
I hesitated calling this a RFC as I'm not sure everyone will like the idea.
Basically the issue encountered was the following:
- Device with its storage flashed with a MBR partition table
- Run fastboot to flash a new OS (and new partition table)
- After flashing a GPT partition table, U-Boot couldn't find any of the partition names from the GPT -> reason is that the partition table entries aren't updated -> so U-Boot still believes it's a MBR table inside and so its parsing fails
This commit adds an update of the table entries inside the write_mbr_and_gpt_partitions() function. At first I thought maybe this should be added in fastboot file (fb_mmc.c) but couldn't think of a good reason why this shouldn't happened in part_efi directly.
Let me know if you have any questions.
Regards, Gary
disk/part_efi.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/disk/part_efi.c b/disk/part_efi.c index 2f922662e6e..7a24e33d189 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -867,6 +867,9 @@ int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf) return 1; }
- /* Update the partition table entries*/
- part_init(dev_desc);
- return 0;
} #endif
This change is for GPT only. Don't we need the same for MBR partition tables (write_mbr_partitions())?
@Simon:
Essentially this reflashing is similar to changing media. What I am missing in part_init() is setting a field with a counter to indicate the media change. The EFI_BLOCK_IO_PROTOCOL has a u32 field media_id. Would struct blk_desc be the right place to add such a field.
As far as "efi_loader" is concerned, none of partitions on the media, either in case of repartitioning or changing media, will no longer be recognized as a "efi disk" after efi subsystem is initialized. All we can and have to do is to just reboot the system.
I think we should take one step further to fixing the issue along with this patch. I have posted a couple of proposals in the past, for example, see [1].
[1] https://lists.denx.de/pipermail/u-boot/2019-January/356499.html
-Takahiro Akashi
Best regards
Heinrich