sh: ecovec: Add support PHY of SMSC

[karo-tx-uboot.git] / README

diff --git a/README b/README
index eba6378536858da57d307e6f7d9721930b00f782..89646725a0b884c5b8b10e4262a1682478788a29 100644 (file)
--- a/README
+++ b/README
@@ -3665,6 +3665,14 @@ List of environment variables (most likely not complete):
 
   fdt_high     - if set this restricts the maximum address that the
                  flattened device tree will be copied into upon boot.
+                 For example, if you have a system with 1 GB memory
+                 at physical address 0x10000000, while Linux kernel
+                 only recognizes the first 704 MB as low memory, you
+                 may need to set fdt_high as 0x3C000000 to have the
+                 device tree blob be copied to the maximum address
+                 of the 704 MB low memory, so that Linux kernel can
+                 access it during the boot procedure.
+
                  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