X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=doc%2FREADME.nand;h=023740e1d364452f77316cf97968be48faf9cd40;hb=e4bf0c5cfe1d7b2059a6802c9e11d567c928dbb1;hp=8eedb6c4d70a1e417a0677ed487ded7f6239c961;hpb=cb32ed1fc298875845f166d326a3f2704a0d5364;p=oweals%2Fu-boot.git

diff --git a/doc/README.nand b/doc/README.nand
index 8eedb6c4d7..023740e1d3 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -78,12 +78,31 @@ Commands:
       should work well, but loading an image copied from another flash is
       going to be trouble if there are any bad blocks.
 
+   nand write.trimffs addr ofs|partition size
+      Enabled by the CONFIG_CMD_NAND_TRIMFFS macro. This command will write to
+      the NAND flash in a manner identical to the 'nand write' command
+      described above -- with the additional check that all pages at the end
+      of eraseblocks which contain only 0xff data will not be written to the
+      NAND flash. This behaviour is required when flashing UBI images
+      containing UBIFS volumes as per the UBI FAQ[1].
+
+      [1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo
+
    nand write.oob addr ofs|partition size
       Write `size' bytes from `addr' to the out-of-band data area
       corresponding to `ofs' in NAND flash. This is limited to the 16 bytes
       of data for one 512-byte page or 2 256-byte pages. There is no check
       for bad blocks.
 
+   nand read.raw addr ofs|partition
+      Read page from `ofs' in NAND flash to `addr'. This reads the raw page,
+      so ECC is avoided and the OOB area is read as well.
+
+   nand write.raw addr ofs|partition
+      Write page from `addr' to `ofs' in NAND flash. This writes the raw page,
+      so ECC is avoided and the OOB area is written as well, making the whole
+      page written as-is.
+
 Configuration Options:
 
    CONFIG_CMD_NAND