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

[Rob Herring <robherring2@gmail.com>]

On 08/24/2012 03:48 AM, Lukasz Majewski wrote:
> 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?

The question I'm asking is why we need partition creation support in
u-boot in the first place? Next you need filesystem creation too?

Rob

> 
> 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
>>
>