From: Jason Hobbs Date: Wed, 31 Aug 2011 05:37:28 +0000 (+0000) Subject: README: document standard image variables X-Git-Tag: v2011.12-rc1~512^2~29 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=dc0b7b0e619e3f1413e626dde193fe21427ac831;p=u-boot README: document standard image variables With these documented, we can start pushing towards standardizing their use across boards. Signed-off-by: Jason Hobbs Cc: Mike Frysinger --- diff --git a/README b/README index 7e032a91be..eb9ade9ad4 100644 --- a/README +++ b/README @@ -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: