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| author | Renaud Barbier <renaud.barbier@ge.com> | 2014-03-13 18:09:59 +0000 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-03-18 17:32:31 +0100 |
| commit | 64e38721cde4d9bf6cca0b9e92a5900da1dd9577 (patch) | |
| tree | 1573bb14518a409257b06de64177c2179306549b /common/ddr_spd.c | |
| parent | df188547a95accdc26369edfdcb84cd5785f4a80 (diff) | |
| download | barebox-64e38721cde4d9bf6cca0b9e92a5900da1dd9577.tar.gz barebox-64e38721cde4d9bf6cca0b9e92a5900da1dd9577.tar.xz | |
common: DDR3 SPD verification support
Add DDR3 SPD verification support for use by the PPC 8xxx DDR driver.
This is based on the equivalent files from U-Boot version git-be937b5.
Signed-off-by: Renaud Barbier <renaud.barbier@ge.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/ddr_spd.c')
| -rw-r--r-- | common/ddr_spd.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/common/ddr_spd.c b/common/ddr_spd.c index c8b73ff56c..ea0b529eed 100644 --- a/common/ddr_spd.c +++ b/common/ddr_spd.c @@ -7,6 +7,7 @@ */ #include <common.h> +#include <crc.h> #include <ddr_spd.h> uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd) @@ -37,3 +38,26 @@ uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd) error: return 1; } + +uint32_t ddr3_spd_checksum_pass(const struct ddr3_spd_eeprom_s *spd) +{ + char crc_lsb, crc_msb; + int csum16, len; + + /* + * SPD byte0[7] - CRC coverage + * 0 = CRC covers bytes 0~125 + * 1 = CRC covers bytes 0~116 + */ + + len = !(spd->info_size_crc & 0x80) ? 126 : 117; + csum16 = cyg_crc16((char *)spd, len); + + crc_lsb = (char) (csum16 & 0xff); + crc_msb = (char) (csum16 >> 8); + + if (spd->crc[0] != crc_lsb || spd->crc[1] != crc_msb) + return 1; + + return 0; +} |