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| author | Kyungmin Park <kyungmin.park@samsung.com> | 2008-11-19 16:25:44 +0100 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2008-11-19 20:34:39 +0100 |
| commit | 961df83361aff9a14f226214224eb8a06e05ba24 (patch) | |
| tree | 9149298130075e1609abcff79a48ed91eb17ab65 /drivers/mtd/ubi/crc32defs.h | |
| parent | f399d4a281713d5ef2d764f05d545fe61e3bd569 (diff) | |
| download | u-boot-961df83361aff9a14f226214224eb8a06e05ba24.tar.gz u-boot-961df83361aff9a14f226214224eb8a06e05ba24.tar.xz u-boot-961df83361aff9a14f226214224eb8a06e05ba24.zip | |
UBI: Add basic UBI support to U-Boot (Part 2/8)
This patch adds basic UBI (Unsorted Block Image) support to U-Boot.
It's based on the Linux UBI version and basically has a "OS"
translation wrapper that defines most Linux specific calls
(spin_lock() etc.) into no-ops. Some source code parts have been
uncommented by "#ifdef UBI_LINUX". This makes it easier to compare
this version with the Linux version and simplifies future UBI
ports/bug-fixes from the Linux version.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/mtd/ubi/crc32defs.h')
| -rw-r--r-- | drivers/mtd/ubi/crc32defs.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/crc32defs.h b/drivers/mtd/ubi/crc32defs.h new file mode 100644 index 0000000000..f5a5401765 --- /dev/null +++ b/drivers/mtd/ubi/crc32defs.h @@ -0,0 +1,32 @@ +/* + * There are multiple 16-bit CRC polynomials in common use, but this is + * *the* standard CRC-32 polynomial, first popularized by Ethernet. + * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0 + */ +#define CRCPOLY_LE 0xedb88320 +#define CRCPOLY_BE 0x04c11db7 + +/* How many bits at a time to use. Requires a table of 4<<CRC_xx_BITS bytes. */ +/* For less performance-sensitive, use 4 */ +#ifndef CRC_LE_BITS +# define CRC_LE_BITS 8 +#endif +#ifndef CRC_BE_BITS +# define CRC_BE_BITS 8 +#endif + +/* + * Little-endian CRC computation. Used with serial bit streams sent + * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. + */ +#if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1 +# error CRC_LE_BITS must be a power of 2 between 1 and 8 +#endif + +/* + * Big-endian CRC computation. Used with serial bit streams sent + * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. + */ +#if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1 +# error CRC_BE_BITS must be a power of 2 between 1 and 8 +#endif |