diff options
| author | Jason Hobbs <jason.hobbs@calxeda.com> | 2011-08-31 05:37:28 +0000 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2011-10-17 22:25:34 +0200 |
| commit | dc0b7b0e619e3f1413e626dde193fe21427ac831 (patch) | |
| tree | c4c9794edf22db2072a622067ed3a1be46210651 /README | |
| parent | 4d91a6ecabd10652abba696e55e952676db0aae1 (diff) | |
README: document standard image variables
With these documented, we can start pushing towards standardizing their
use across boards.
Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -3558,6 +3558,25 @@ List of environment variables (most likely not complete): Ethernet is encapsulated/received over 802.1q VLAN tagged frames. +The following image location variables contain the location of images +used in booting. The "Image" column gives the role of the image and is +not an environment variable name. The other columns are environment +variable names. "File Name" gives the name of the file on a TFTP +server, "RAM Address" gives the location in RAM the image will be +loaded to, and "Flash Location" gives the image's address in NOR +flash or offset in NAND flash. + +*Note* - these variables don't have to be defined for all boards, some +boards currenlty use other variables for these purposes, and some +boards use these variables for other purposes. + +Image File Name RAM Address Flash Location +----- --------- ----------- -------------- +u-boot u-boot u-boot_addr_r u-boot_addr +Linux kernel bootfile kernel_addr_r kernel_addr +device tree blob fdtfile fdt_addr_r fdt_addr +ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr + The following environment variables may be used and automatically updated by the network boot commands ("bootp" and "rarpboot"), depending the information provided by your boot server: |