Add zero-copy ramdisk support (requires corresponding kernel support!)

[karo-tx-uboot.git] / README

diff --git a/README b/README
index 4dfb292bf5a1bcd31e3e167ce4faa5d4c1c3b7cf..ecc087ad914b20afd6ad63008a780ffe23629ca0 100644 (file)
--- a/README
+++ b/README
@@ -1988,6 +1988,14 @@ Some configuration options can be set using Environment Variables:
 
                  setenv initrd_high 00c00000
 
 
                  setenv initrd_high 00c00000
 

+                  If you set initrd_high to 0xFFFFFFFF, this is an
+                  indication to U-Boot that all addresses are legal
+                  for the Linux kernel, including addresses in flash
+                  memory. In this case U-Boot will NOT COPY the
+                  ramdisk at all. This may be useful to reduce the
+                  boot time on your system, but requires that this
+                  feature is supported by your Linux kernel.
+

   ipaddr       - IP address; needed for tftpboot command
 
   loadaddr     - Default load address for commands like "bootp",
   ipaddr       - IP address; needed for tftpboot command
 
   loadaddr     - Default load address for commands like "bootp",