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

[karo-tx-uboot.git] / README

diff --git a/README b/README
index 111c1b9fa69df4aa5ac0eae7875496c8f3875919..ecc087ad914b20afd6ad63008a780ffe23629ca0 100644 (file)
--- a/README
+++ b/README
@@ -470,6 +470,13 @@ The following options need to be configured:
                Set to 0 to disable this feature (this is the default).
                This will also disable hardware handshake.
 
                Set to 0 to disable this feature (this is the default).
                This will also disable hardware handshake.
 

+- Console UART Number:
+               CONFIG_UART1_CONSOLE
+
+               IBM PPC4xx only.
+               If defined internal UART1 (and not UART0) is used
+               as default U-Boot console.
+

 - Boot Delay:  CONFIG_BOOTDELAY - in seconds
                Delay before automatically booting the default image;
                set to -1 to disable autoboot.
 - Boot Delay:  CONFIG_BOOTDELAY - in seconds
                Delay before automatically booting the default image;
                set to -1 to disable autoboot.


@@ -1710,13 +1717,13 @@ Low Level (hardware related) configuration options:
                #define'd default value in commproc.h resp.
                cpm_8260.h.
 
                #define'd default value in commproc.h resp.
                cpm_8260.h.
 

-- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB, 
-  CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL, 
-  CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS, 
-  CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB, 
-  CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 
-  CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL, 
-  CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE, 
+- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB,
+  CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL,
+  CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS,
+  CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB,
+  CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
+  CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL,
+  CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE,

   CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
                Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
 
   CFG_POCMR2_MASK_ATTRIB: (MPC826x only)
                Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
 


@@ -1981,6 +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",