From 7d721e34ae6be7d7db63e8d060a246278bb7ae58 Mon Sep 17 00:00:00 2001 From: Bartlomiej Sieka <tur@semihalf.com> Date: Mon, 14 Apr 2008 15:44:16 +0200 Subject: [PATCH] Boot-related documentation update - document 'bootm_low' and 'bootm_size' environment variables - update inaccurate CFG_BOOTMAPSZ entry Signed-off-by: Bartlomiej Sieka <tur@semihalf.com> --- README | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/README b/README index 7c1634580a..3a10bd762b 100644 --- a/README +++ b/README @@ -1997,8 +1997,11 @@ Configuration Settings: - CFG_BOOTMAPSZ: 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. + the Linux kernel (bd_info, boot arguments, FDT blob if + used) 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. - CFG_MAX_FLASH_BANKS: Max number of Flash memory banks @@ -2743,6 +2746,20 @@ 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. + autoload - if set to "no" (any string beginning with 'n'), "bootp" will just load perform a lookup of the configuration from the BOOTP server, but not try to -- GitLab