diff options
author | Jason Hobbs <jason.hobbs@calxeda.com> | 2011-08-31 10:37:28 -0500 |
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committer | John Rigby <john.rigby@linaro.org> | 2011-09-23 07:10:38 -0600 |
commit | fa57979ea8ed445820a24e1282c74bf60a5e6093 (patch) | |
tree | 742c4ae068f81e62a581ffaace78357f9c57bbcb | |
parent | e13334c17174847790b1ec68f0e87105b2636c56 (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>
-rw-r--r-- | README | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -3507,6 +3507,25 @@ 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: |