From 5a5f1455c1076d2b153dc3736ff02844fddb90e1 Mon Sep 17 00:00:00 2001 From: Jason Hobbs Date: Wed, 31 Aug 2011 10:37:28 -0500 Subject: 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 --- README | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/README b/README index a43da97a4..6cae0f6d2 100644 --- a/README +++ b/README @@ -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: -- cgit v1.2.3