[U-Boot] [PATCH V3 3/8] arm: Add savebp implementation for arm

[Simon Schwarz <simonschwarzcor@googlemail.com>]

Dear Andreas,

On 08/25/2011 01:08 PM, Andreas Bie?mann wrote:
> Dear Simon,
>
> Am 25.08.2011 10:33, schrieb Simon Schwarz:
>> This adds the savebp implementation to the arm platform.
>
> please reorder your series and let this come before 'Add savebp command'
> cause that patch uses functionality from this one.
>

Will do.

>> Related CONFIGs:
>> CONFIG_CMD_SAVEBP_WRITE_SIZE defines the size of the image to write
>>
>> Signed-off-by: Simon Schwarz<simonschwarzcor@gmail.com>
>> ---
>>
>> V2 changes:
>> DEL _cosmetic_ old comment
>>
>> V3 changes:
>> nothing
>> ---
>>   arch/arm/include/asm/savebp.h |   27 ++++++++++++
>>   arch/arm/lib/Makefile         |    1 +
>>   arch/arm/lib/savebp.c         |   91 +++++++++++++++++++++++++++++++++++++++++
>>   include/command.h             |    5 ++
>>   include/configs/devkit8000.h  |    1 +
>
> documentation of  CONFIG_CMD_SAVEBP_WRITE_SIZE  is missing
>

Will add.

>> diff --git a/arch/arm/include/asm/savebp.h b/arch/arm/include/asm/savebp.h
>> new file mode 100644
>> index 0000000..3774e45
>> --- /dev/null
>> +++ b/arch/arm/include/asm/savebp.h
>> @@ -0,0 +1,27 @@
>> +/* Copyright (C) 2011
>> + * Corscience GmbH&  Co. KG - Simon Schwarz<schwarz@corscience.de>
>> + *
>> + * See file CREDITS for list of people who contributed to this
>> + * project.
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation; either version 2 of
>> + * the License, or (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
>> + * MA 02111-1307 USA
>> + */
>> +#ifndef _SAVEBP_H_
>> +#define _SAVEBP_H_
>> +
>> +extern bootm_headers_t images;
>
> You made that available globally in your first patch of this series,
> please remove that from first patch and move to this one.

ok.

>
> <snip>
>
> BTW while reading this patch I got another idea to solve problem 'how
> get we saved the boot information to<storage>'.
> The required information regardless of whether it is ATAGS or FDT is
> only a blob at some place in ram after the 'bootm x' commands used in
> 'Add savebp command'. Saving a blob from location X with size Y to
> location Z is easy and already implemented.
>
> So the only required thing is to get the 'blob' prepared in RAM. In my
> opinion this could be a subcommand of bootm instead of a new command.
>
> How about:
>
> ---8<---
> # bootm savebp
> ...done boot information is @0x80000100 with size 0x100
> # nandecc hw
> # nand erase ...
> # nand write 80000100 ...
> --->8---

This was actually my first implementation (although not with a switch):
http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/102669

It was criticised because saving the parameter images is not the 
responsibility of bootm - which is true. Although adding a switch would 
be a cleaner solution than my first implementation - would that be 
acceptable?

How about implementing it as bootm subcommand?

>
> regards
>
> Andreas Bie?mann

Regards & thx for reviewing
Simon