[U-Boot-Users] [PATCH] Document 'bootm_low' and 'bootm_size' environment variables

[Kumar Gala]

On Apr 9, 2008, at 4:39 PM, Bartlomiej Sieka wrote:
> Signed-off-by: Bartlomiej Sieka <tur at semihalf.com>
> ---
> Kumar, this patch pertains to your commit "[new uImage] Provide  
> ability to
> restrict region used for boot images", id d3f2fa0d -- could you review
> and confirm that the documentation is OK? Thanks.
>
> README |   19 ++++++++++++++++++-
> 1 files changed, 18 insertions(+), 1 deletions(-)
>
> diff --git a/README b/README
> index 5d059e7..a0dfe73 100644
> --- a/README
> +++ b/README
> @@ -1995,7 +1995,10 @@ Configuration Settings:
> 		Maximum size of memory mapped by the startup code of
> 		the Linux kernel; all data that must be processed by
> 		the Linux kernel (bd_info, boot arguments, eventually
> -		initrd image) must be put below this limit.
> +		initrd image) must be put below this limit, unless
> +		"bootm_low" enviroment variable is defined and non-zero.
> +		In such case all data for the Linux kernel must be
> +		between "bootm_low" and "bootm_low" + CFG_BOOTMAPSZ.

all data seems misleading since initrd doesn't have to be within  
CFG_BOOTMAPSZ.

> - CFG_MAX_FLASH_BANKS:
> 		Max number of Flash memory banks
> @@ -2733,6 +2736,20 @@ Some configuration options can be set using  
> Environment Variables:
>
>   bootfile	- Name of the image to load with TFTP
>
> +  bootm_low	- Memory range available for image processing in the  
> bootm
> +		  command can be restricted. This variable is given as
> +		  a hexadecimal number and defines lowest address allowed
> +		  for use by the bootm command. See also "bootm_size"
> +		  environment variable. Address defined by "bootm_low" is
> +		  also the base of the initial memory mapping for the Linux
> +		  kernel -- see the descripton of CFG_BOOTMAPSZ.

>
> +
> +  bootm_size	- Memory range available for image processing in the  
> bootm
> +		  command can be restricted. This variable is given as
> +		  a hexadecimal number and defines the size of the region
> +		  allowed for use by the bootm command. See also "bootm_low"
> +		  environment variable.
> +

these look fine.

- k