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| author | Grant Likely <grant.likely@linaro.org> | 2011-03-28 09:58:43 +0000 |
|---|---|---|
| committer | Gerald Van Baren <gvb@unssw.com> | 2011-04-25 21:11:20 -0400 |
| commit | c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51 (patch) | |
| tree | 9a9de9718b28b0a526708466f5eb12782352607d /README | |
| parent | 590d3cacb98cb377b127869b58507d2afe9c904a (diff) | |
| download | u-boot-imx-c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51.zip u-boot-imx-c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51.tar.gz u-boot-imx-c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51.tar.bz2 | |
Default to bootm_size() when CONFIG_SYS_BOOTMAPSZ is not defined
This patch adds a function getenv_bootm_mapsize() for obtaining the
size of the early mapped region accessible by the kernel during early
boot. It defaults to CONFIG_SYS_BOOTMAPSZ, or if not defined,
defaults to getenv_bootm_size(), which in turn defaults to the size of
RAM.
getenv_bootm_mapsize() can also be overridden with a "bootm_mapsize"
environmental variable.
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 16 |
1 files changed, 14 insertions, 2 deletions
@@ -2348,7 +2348,10 @@ Configuration Settings: 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" + CONFIG_SYS_BOOTMAPSZ. + and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment + variable "bootm_mapsize" will override the value of + CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, + then the value in "bootm_size" will be used instead. - CONFIG_SYS_BOOT_RAMDISK_HIGH: Enable initrd_high functionality. If defined then the @@ -3184,7 +3187,16 @@ List of environment variables (most likely not complete): 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 description of CONFIG_SYS_BOOTMAPSZ. + kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and + bootm_mapsize. + + bootm_mapsize - Size of the initial memory mapping for the Linux kernel. + This variable is given as a hexadecimal number and it + defines the size of the memory region starting at base + address bootm_low that is accessible by the Linux kernel + during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used + as the default value if it is defined, and bootm_size is + used otherwise. bootm_size - Memory range available for image processing in the bootm command can be restricted. This variable is given as |