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git.ipfire.org Git - thirdparty/u-boot.git/blob - common/ddr_spd.c
1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright 2008-2014 Freescale Semiconductor, Inc.
9 /* used for ddr1 and ddr2 spd */
11 spd_check(const u8
*buf
, u8 spd_rev
, u8 spd_cksum
)
13 unsigned int cksum
= 0;
17 * Check SPD revision supported
18 * Rev 1.X or less supported by this code
20 if (spd_rev
>= 0x20) {
21 printf("SPD revision %02X not supported by this code\n",
26 printf("SPD revision %02X not verified by this code\n",
33 for (i
= 0; i
< 63; i
++) {
38 if (cksum
!= spd_cksum
) {
39 printf("SPD checksum unexpected. "
40 "Checksum in SPD = %02X, computed SPD = %02X\n",
49 ddr1_spd_check(const ddr1_spd_eeprom_t
*spd
)
51 const u8
*p
= (const u8
*)spd
;
53 return spd_check(p
, spd
->spd_rev
, spd
->cksum
);
57 ddr2_spd_check(const ddr2_spd_eeprom_t
*spd
)
59 const u8
*p
= (const u8
*)spd
;
61 return spd_check(p
, spd
->spd_rev
, spd
->cksum
);
65 * CRC16 compute for DDR3 SPD
66 * Copied from DDR3 SPD spec.
69 crc16(char *ptr
, int count
)
74 while (--count
>= 0) {
75 crc
= crc
^ (int)*ptr
++ << 8;
76 for (i
= 0; i
< 8; ++i
)
78 crc
= crc
<< 1 ^ 0x1021;
86 ddr3_spd_check(const ddr3_spd_eeprom_t
*spd
)
88 char *p
= (char *)spd
;
91 char crc_lsb
; /* byte 126 */
92 char crc_msb
; /* byte 127 */
95 * SPD byte0[7] - CRC coverage
96 * 0 = CRC covers bytes 0~125
97 * 1 = CRC covers bytes 0~116
100 len
= !(spd
->info_size_crc
& 0x80) ? 126 : 117;
101 csum16
= crc16(p
, len
);
103 crc_lsb
= (char) (csum16
& 0xff);
104 crc_msb
= (char) (csum16
>> 8);
106 if (spd
->crc
[0] == crc_lsb
&& spd
->crc
[1] == crc_msb
) {
109 printf("SPD checksum unexpected.\n"
110 "Checksum lsb in SPD = %02X, computed SPD = %02X\n"
111 "Checksum msb in SPD = %02X, computed SPD = %02X\n",
112 spd
->crc
[0], crc_lsb
, spd
->crc
[1], crc_msb
);
117 unsigned int ddr4_spd_check(const struct ddr4_spd_eeprom_s
*spd
)
119 char *p
= (char *)spd
;
122 char crc_lsb
; /* byte 126 */
123 char crc_msb
; /* byte 127 */
126 csum16
= crc16(p
, len
);
128 crc_lsb
= (char) (csum16
& 0xff);
129 crc_msb
= (char) (csum16
>> 8);
131 if (spd
->crc
[0] != crc_lsb
|| spd
->crc
[1] != crc_msb
) {
132 printf("SPD checksum unexpected.\n"
133 "Checksum lsb in SPD = %02X, computed SPD = %02X\n"
134 "Checksum msb in SPD = %02X, computed SPD = %02X\n",
135 spd
->crc
[0], crc_lsb
, spd
->crc
[1], crc_msb
);
139 p
= (char *)((ulong
)spd
+ 128);
141 csum16
= crc16(p
, len
);
143 crc_lsb
= (char) (csum16
& 0xff);
144 crc_msb
= (char) (csum16
>> 8);
146 if (spd
->mod_section
.uc
[126] != crc_lsb
||
147 spd
->mod_section
.uc
[127] != crc_msb
) {
148 printf("SPD checksum unexpected.\n"
149 "Checksum lsb in SPD = %02X, computed SPD = %02X\n"
150 "Checksum msb in SPD = %02X, computed SPD = %02X\n",
151 spd
->mod_section
.uc
[126],
152 crc_lsb
, spd
->mod_section
.uc
[127],