From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lukasz Majewski <l.majewski@samsung.com>
Date: Fri, 24 Aug 2012 10:48:36 +0200
Subject: [U-Boot] gpt: GUID/UUID - GPT restoration - open questions
In-Reply-To: <1345795995-24656-1-git-send-email-l.majewski@samsung.com>
References: <1345795995-24656-1-git-send-email-l.majewski@samsung.com>
Message-ID: <20120824104836.22dfc647@amdc308.digital.local>
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To: u-boot@lists.denx.de

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