ppc4xx: Fixed compilation warning in 4xx_enet.c

[oweals/u-boot.git] / doc / README.JFFS2

diff --git a/doc/README.JFFS2 b/doc/README.JFFS2
index 0d39c46453a8489a61403a3bb09e9b8cd77a4fcb..f0e9bc1b37aacf8ebb8b0ddc50d61e577b1f9399 100644 (file)
--- a/doc/README.JFFS2
+++ b/doc/README.JFFS2
@@ -2,12 +2,21 @@ JFFS2 options and usage.
 -----------------------
 
 JFFS2 in U-Boot is a read only implementation of the file system in
 -----------------------
 
 JFFS2 in U-Boot is a read only implementation of the file system in

-Linux with the same name. To use JFFS2 define CFG_CMD_JFFS2.
+Linux with the same name. To use JFFS2 define CONFIG_CMD_JFFS2.

 
 The module adds three new commands.
 fsload  - load binary file from a file system image
 fsinfo  - print information about file systems
 ls      - list files in a directory
 
 The module adds three new commands.
 fsload  - load binary file from a file system image
 fsinfo  - print information about file systems
 ls      - list files in a directory

+chpart  - change active partition
+
+If you boot from a partition which is mounted writable, and you
+update your boot environment by replacing single files on that
+partition, you should also define CONFIG_SYS_JFFS2_SORT_FRAGMENTS. Scanning
+the JFFS2 filesystem takes *much* longer with this feature, though.
+Sorting is done while inserting into the fragment list, which is
+more or less a bubble sort. That algorithm is known to be O(n^2),
+thus you should really consider if you can avoid it!

 
 
 There is two ways for JFFS2 to find the disk. The default way uses
 
 
 There is two ways for JFFS2 to find the disk. The default way uses


@@ -15,16 +24,16 @@ the flash_info structure to find the start of a JFFS2 disk (called
 partition in the code) and you can change where the partition is with
 two defines.
 
 partition in the code) and you can change where the partition is with
 two defines.
 

-CFG_JFFS2_FIRST_BANK
+CONFIG_SYS_JFFS2_FIRST_BANK

        defined the first flash bank to use
 
        defined the first flash bank to use
 

-CFG_JFFS2_FIRST_SECTOR
+CONFIG_SYS_JFFS2_FIRST_SECTOR

        defines the first sector to use
 
 
        defines the first sector to use
 
 

-The second way is to define CFG_JFFS_CUSTOM_PART and implement the
+The second way is to define CONFIG_SYS_JFFS_CUSTOM_PART and implement the

 jffs2_part_info(int part_num) function in your board specific files.
 jffs2_part_info(int part_num) function in your board specific files.

-In this mode CFG_JFFS2_FIRST_BANK and CFG_JFFS2_FIRST_SECTOR is not
+In this mode CONFIG_SYS_JFFS2_FIRST_BANK and CONFIG_SYS_JFFS2_FIRST_SECTOR is not

 used.
 
 The input is a partition number starting with 0.
 used.
 
 The input is a partition number starting with 0.


@@ -32,7 +41,7 @@ Return a pointer to struct part_info or NULL for error;
 
 Ex jffs2_part_info() for one partition.
 ---
 
 Ex jffs2_part_info() for one partition.
 ---

-#if defined CFG_JFFS_CUSTOM_PART
+#if defined CONFIG_SYS_JFFS_CUSTOM_PART

 #include <jffs2/jffs2.h>
 
 static struct part_info part;
 #include <jffs2/jffs2.h>
 
 static struct part_info part;


@@ -60,9 +69,6 @@ jffs2_part_info(int part_num)
 
 TODO.
 
 
 TODO.
 

-        Add a new command so it's actually possible to change
-       partition.
-
-        Remove the assumption that JFFS can dereference a pointer
-        into the disk. The current code do not work with memory holes
-        or hardware with a sliding window (PCMCIA).
+       Remove the assumption that JFFS can dereference a pointer
+       into the disk. The current code do not work with memory holes
+       or hardware with a sliding window (PCMCIA).