40 lines
817 B
C
40 lines
817 B
C
/*
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* Copyright 2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*/
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#include <common.h>
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#include <ddr_spd.h>
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uint32_t ddr2_spd_checksum_pass(const struct ddr2_spd_eeprom_s *spd)
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{
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uint32_t i, cksum = 0;
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const uint8_t *buf = (const uint8_t *)spd;
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uint8_t rev, spd_cksum;
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rev = spd->spd_rev;
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spd_cksum = spd->cksum;
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/* Rev 1.X or less supported by this code */
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if (rev >= 0x20)
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goto error;
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/*
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* The checksum is calculated on the first 64 bytes
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* of the SPD as per JEDEC specification.
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*/
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for (i = 0; i < 63; i++)
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cksum += *buf++;
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cksum &= 0xFF;
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if (cksum != spd_cksum)
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goto error;
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return 0;
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error:
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return 1;
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}
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