b138ac83b5
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@783 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
32 lines
770 B
C
32 lines
770 B
C
#define SMBUS_MEM_DEVICE_START 0x50
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#define SMBUS_MEM_DEVICE_END 0x53
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#define SMBUS_MEM_DEVICE_INC 1
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static void spd_set_drb(void)
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{
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/*
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* Effects: Uses serial presence detect to set the
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* DRB registers which holds the ending memory address assigned
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* to each DIMM.
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*/
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unsigned end_of_memory;
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unsigned char device;
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end_of_memory = 0; /* in multiples of 8MiB */
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device = SMBUS_MEM_DEVICE_START;
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while (device <= SMBUS_MEM_DEVICE_END) {
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unsigned side1_bits, side2_bits;
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int byte, byte2;
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side1_bits = side2_bits = -1;
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/* Compute the end address for the DRB register */
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/* Only process dimms < 2GB (2^8 * 8MB) */
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if (side1_bits < 8) {
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end_of_memory += (1 << side1_bits);
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}
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device += SMBUS_MEM_DEVICE_INC;
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}
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}
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