From 51c2345bd24837f9f67f16268da6dc71573f1325 Mon Sep 17 00:00:00 2001 From: Philipp Tomsich Date: Sun, 25 Nov 2018 19:22:19 +0100 Subject: Roll CRC16-CCITT into the hash infrastructure The CRC16-CCITT checksum function is useful for space-constrained applications (such as obtaining a checksum across a 2KBit or 4KBit EEPROM) in boot applications. It has not been accessible from boot scripts until now (due to not having a dedicated command and not being supported by the hash infrstructure) limiting its applicability outside of custom commands. This adds the CRC16-CCITT (poly 0x1021, init 0x0) algorithm to the list of available hashes and adds a new crc16_ccitt_wd_buf() to make this possible. Signed-off-by: Philipp Tomsich [trini: Fix building crc16.o for SPL/TPL] Signed-off-by: Tom Rini --- include/u-boot/crc.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/u-boot/crc.h b/include/u-boot/crc.h index 111b22c4b6..788ef29a17 100644 --- a/include/u-boot/crc.h +++ b/include/u-boot/crc.h @@ -13,6 +13,17 @@ unsigned int crc8(unsigned int crc_start, const unsigned char *vptr, int len); /* lib/crc16.c - 16 bit CRC with polynomial x^16+x^12+x^5+1 (CRC-CCITT) */ uint16_t crc16_ccitt(uint16_t crc_start, const unsigned char *s, int len); +/** + * crc16_ccitt_wd_buf - Perform CRC16-CCIT on an input buffer and return the + * 16-bit result (network byte-order) in an output buffer + * + * @in: input buffer + * @len: input buffer length + * @out: output buffer (at least 2 bytes) + * @chunk_sz: ignored + */ +void crc16_ccitt_wd_buf(const uint8_t *in, uint len, + uint8_t *out, uint chunk_sz); /* lib/crc32.c */ uint32_t crc32 (uint32_t, const unsigned char *, uint); -- cgit v1.2.1