[U-Boot] gpt: GUID/UUID - GPT restoration - open questions

Lukasz Majewski
2012-08-24T08:48:36Z

Hi Stephen,

I'm writing to you, since I've posted a patch series regarding GPT
support for Samsung Trats board (you were on the CC).

e.g. http://patchwork.ozlabs.org/patch/179785/

I think, that we can cooperate to provide better EFI/GPT support.

In mine implementation the "gpt" command (with several sub commands) has
been proposed
- we can discuss if this is a correct way to go.

Moreover, at this patch series a "weak" GUID generator is implemented.
For now it is "good enough", since I consider the restoration as an
emergency situation.
However,I wonder how can we provide better GUID (and in general random
numbers pool) generator for u-boot.

Maybe md5sum command can be used with some running clock (WDT, or
system clock from u-boot start up) data to provide better entropy?

Any ideas?

Regards,
Lukasz

> This patch series provides a new command - "gpt" for eMMC partition
> table (in the GPT format) restoration and display.
>
> As a pre-work, some cleanup at the part_efi.c file was performed to
> remove custom macros and make GPT related structures more readable.
>
> The GPT detailed description has been written to README.gpt file.
>
> Tested at:
> - Exynos4210 rev.1 - TRATS Samsung development board
>
> Lukasz Majewski (6):
> gpt:doc: GPT (GUID Partition Table) documentation
> gpt: Replace the leXX_to_int() calls with ones defined at
> <compiler.h>
> gpt: Replacement of GPT structures members with ones indicating
> endianness and size
> gpt: Support for GPT (GUID Partition Table) restoration
> gpt: Support for new "gpt" command
> gpt: Enable support for GPT partition table restoration at Samsung's
> Trats
>
> common/Makefile | 1 +
> common/cmd_gpt.c | 182 ++++++++++++++++++++++++++
> disk/part_efi.c | 334
> +++++++++++++++++++++++++++++++++++++----------
> disk/part_efi.h | 85 ++++++------ doc/README.gpt
> | 199 ++++++++++++++++++++++++++++ include/configs/trats.h | 23
> +++- include/part.h | 2 +
> 7 files changed, 715 insertions(+), 111 deletions(-)
> create mode 100644 common/cmd_gpt.c
> create mode 100644 doc/README.gpt
>

--
Best regards,

Lukasz Majewski

Samsung Poland R&D Center | Linux Platform Group