diff options
| author | Gregory Nutt <gnutt@nuttx.org> | 2013-12-04 16:41:45 -0600 |
|---|---|---|
| committer | Gregory Nutt <gnutt@nuttx.org> | 2013-12-04 16:41:45 -0600 |
| commit | 1077db9bc326ffdebacf9589393f085c2b8e7755 (patch) | |
| tree | c2075d32d25507b262c9500e8722717817a85a85 | |
| parent | edc43a08908d200d5aa88c7a78f0dd94e5bac3aa (diff) | |
| download | px4-nuttx-1077db9bc326ffdebacf9589393f085c2b8e7755.tar.gz px4-nuttx-1077db9bc326ffdebacf9589393f085c2b8e7755.tar.bz2 px4-nuttx-1077db9bc326ffdebacf9589393f085c2b8e7755.zip | |
Cosmetic updates to comments and READMEs
| -rw-r--r-- | nuttx/arch/arm/src/sama5/sam_pmecc.c | 4 | ||||
| -rw-r--r-- | nuttx/configs/sama5d3x-ek/README.txt | 3 | ||||
| -rw-r--r-- | nuttx/drivers/mtd/README.txt | 11 |
3 files changed, 12 insertions, 6 deletions
diff --git a/nuttx/arch/arm/src/sama5/sam_pmecc.c b/nuttx/arch/arm/src/sama5/sam_pmecc.c index b42278bcc..627cb6cce 100644 --- a/nuttx/arch/arm/src/sama5/sam_pmecc.c +++ b/nuttx/arch/arm/src/sama5/sam_pmecc.c @@ -1153,7 +1153,9 @@ int pmecc_configure(struct sam_nandcs_s *priv, bool protected) } /* Save the size of the spare area. - * REVISIT: Could we save a bit by setting this to eccend? + * + * REVISIT: Could we save a bit by setting this to eccend since there is + * no need to read beyond that? */ g_pmecc.desc.sparesize = priv->raw.model.sparesize; diff --git a/nuttx/configs/sama5d3x-ek/README.txt b/nuttx/configs/sama5d3x-ek/README.txt index 8350efc23..7904a6c91 100644 --- a/nuttx/configs/sama5d3x-ek/README.txt +++ b/nuttx/configs/sama5d3x-ek/README.txt @@ -1466,7 +1466,8 @@ NAND Support Another option is Smart FS. Smart FS is another small file system designed to work with FLASH. Properties: It does support some wear- - leveling, but like FAT, cannot handle bad blocks. + leveling like NXFFS, but like FAT, cannot handle bad blocks and like + NXFFS, it will try to re-write erased bits. Using NAND with NXFFS --------------------- diff --git a/nuttx/drivers/mtd/README.txt b/nuttx/drivers/mtd/README.txt index ea7bcfbde..76498096b 100644 --- a/nuttx/drivers/mtd/README.txt +++ b/nuttx/drivers/mtd/README.txt @@ -123,11 +123,12 @@ NAND MEMORY SMART FS -------- - I have not yet tried SmartFS. But I know that it does not perform bad - block checking (like FAT). I do not know if it assumes that it can write - into erased regions of a sector multiple times (like NXFFS). + I have not yet tried SmartFS. It does support some wear-leveling + similar to NXFFS, but like FAT, cannot handle bad blocks and like NXFFS, + it will try to re-write erased bits. So SmartFS is not really an + option either. - What is Needed + What is Needed -------------- What is needed to work with FAT properly would be another MTD layer @@ -136,3 +137,5 @@ NAND MEMORY on top of the NAND. Another, less general, option would be support bad blocks within FAT. + Such a solution migh be possible for SLC NAND, but would not be + sufficiently general for all NAND types. |