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| author | David A. Long <dave.long@linaro.org> | 2011-07-09 16:40:19 -0400 |
|---|---|---|
| committer | Gerald Van Baren <gvb@unssw.com> | 2011-07-16 11:58:30 -0400 |
| commit | a28afca57df7875f3334407bc47bd66b98701534 (patch) | |
| tree | b89c2dabc45f99a003d4f2881f7a775415800805 /README | |
| parent | a8d2a75d729ef0a701258a4b5bfcaf121fa30463 (diff) | |
| download | u-boot-imx-a28afca57df7875f3334407bc47bd66b98701534.zip u-boot-imx-a28afca57df7875f3334407bc47bd66b98701534.tar.gz u-boot-imx-a28afca57df7875f3334407bc47bd66b98701534.tar.bz2 | |
Add uboot "fdt_high" enviroment variable
Add a new "fdt_high" enviroment variable. This can be used to control (or prevent) the
relocation of the flattened device tree on boot. It can be used to prevent relocation
of the fdt into highmem. The variable behaves similarly to the existing "initrd_high"
variable.
Signed-off-by: David A. Long <dave.long@linaro.org>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -3305,6 +3305,15 @@ List of environment variables (most likely not complete): This can be used to load and uncompress arbitrary data. + fdt_high - if set this restricts the maximum address that the + flattened device tree will be copied into upon boot. + If this is set to the special value 0xFFFFFFFF then + the fdt will not be copied at all on boot. For this + to work it must reside in writable memory, have + sufficient padding on the end of it for u-boot to + add the information it needs into it, and the memory + must be accessible by the kernel. + i2cfast - (PPC405GP|PPC405EP only) if set to 'y' configures Linux I2C driver for fast mode (400kHZ). This environment variable is used in |