X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=doc%2FREADME.nand;h=6dac24cd90adcfb0eb8e73892882ce27ea8cd955;hb=508eb85db7065e34948c189c83f7e348c1cfd61e;hp=c5c5ef29e6390df037679b2734737dceaca507ce;hpb=85fad497b3c2e99fa48d18351d2898cf8cdbe898;p=platform%2Fkernel%2Fu-boot.git

diff --git a/doc/README.nand b/doc/README.nand
index c5c5ef2..6dac24c 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -57,14 +57,9 @@ Commands:
       Print information about all of the NAND devices found.
 
    nand read addr ofs|partition size
-      Read `size' bytes from `ofs' in NAND flash to `addr'. If a page
-      cannot be read because it is marked bad or an uncorrectable data
-      error is found the command stops with an error.
-
-   nand read.jffs2 addr ofs|partition size
-      Like `read', but the data for blocks that are marked bad is read as
-      0xff. This gives a readable JFFS2 image that can be processed by
-      the JFFS2 commands such as ls and fsload.
+      Read `size' bytes from `ofs' in NAND flash to `addr'.  Blocks that
+      are marked bad are skipped.  If a page cannot be read because an
+      uncorrectable data error is found, the command stops with an error.
 
    nand read.oob addr ofs|partition size
       Read `size' bytes from the out-of-band data area corresponding to
@@ -73,17 +68,15 @@ Commands:
       for bad blocks or ECC errors.
 
    nand write addr ofs|partition size
-      Write `size' bytes from `addr' to `ofs' in NAND flash. If a page
-      cannot be written because it is marked bad or the write fails the
-      command stops with an error.
-
-   nand write.jffs2 addr ofs|partition size
-      Like `write', but blocks that are marked bad are skipped and the
-      is written to the next block instead. This allows writing writing
-      a JFFS2 image, as long as the image is short enough to fit even
-      after skipping the bad blocks. Compact images, such as those
-      produced by mkfs.jffs2 should work well, but loading an image copied
-      from another flash is going to be trouble if there are any bad blocks.
+      Write `size' bytes from `addr' to `ofs' in NAND flash.  Blocks that
+      are marked bad are skipped.  If a page cannot be read because an
+      uncorrectable data error is found, the command stops with an error.
+
+      As JFFS2 skips blocks similarly, this allows writing a JFFS2 image,
+      as long as the image is short enough to fit even after skipping the
+      bad blocks.  Compact images, such as those produced by mkfs.jffs2
+      should work well, but loading an image copied from another flash is
+      going to be trouble if there are any bad blocks.
 
    nand write.oob addr ofs|partition size
       Write `size' bytes from `addr' to the out-of-band data area
@@ -181,6 +174,14 @@ More Definitions:
    #define NAND_MAX_FLOORS 1
    #define NAND_MAX_CHIPS 1
 
+   #define CFG_DAVINCI_BROKEN_ECC
+      Versions of U-Boot <= 1.3.3 and Montavista Linux kernels
+      generated bogus ECCs on large-page NAND. Both large and small page
+      NAND ECCs were incompatible with the Linux davinci git tree (since
+      NAND was integrated in 2.6.24).
+      Turn this ON if you want backwards compatibility.
+      Turn this OFF if you want U-Boot and the Linux davinci git kernel
+      to use the same ECC format.
 
 NOTE:
 =====
@@ -191,7 +192,7 @@ We now use a complete rewrite of the NAND code based on what is in
 The old NAND handling code has been re-factored and is now confined
 to only board-specific files and - unfortunately - to the DoC code
 (see below). A new configuration variable has been introduced:
-CFG_NAND_LEGACY, which has to be defined in the board config file if
+CONFIG_NAND_LEGACY, which has to be defined in the board config file if
 that board uses legacy code.
 
 The necessary changes have been made to all affected boards, and no
@@ -215,12 +216,6 @@ JFFS2 related commands:
   using both the new code which is able to skip bad blocks
   "nand erase clean" additionally writes JFFS2-cleanmarkers in the oob.
 
-  "nand write.jffs2"
-  like "nand write" but skip found bad eraseblocks
-
-  "nand read.jffs2"
-  like "nand read" but skip found bad eraseblocks
-
 Miscellaneous and testing commands:
   "markbad [offset]"
   create an artificial bad block (for testing bad block handling)