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DRAM row implementation, part 1.

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This commit is contained in:
OBattler
2023-07-12 00:15:43 +02:00
parent d68a3675de
commit 22d84443a8
2 changed files with 352 additions and 3 deletions
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7
src/mem/spd.c
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@@ -401,7 +401,7 @@ spd_write_drbs(uint8_t *regs, uint8_t reg_min, uint8_t reg_max, uint8_t drb_unit
}
}
/* Needed for 430LX. */
/* Needed for 430NX. */
void
spd_write_drbs_with_ext(uint8_t *regs, uint8_t reg_min, uint8_t reg_max, uint8_t drb_unit)
{
@@ -447,8 +447,9 @@ spd_write_drbs_with_ext(uint8_t *regs, uint8_t reg_min, uint8_t reg_max, uint8_t
row_val += size / drb_unit; /* this will intentionally overflow on 440GX with 2 GB */
regs[drb] = row_val & 0xff;
drb = reg_min + 8 + (row >> 1);
shift = (row & 0x01) << 3;
regs[drb] = (((row_val & 0xfff) >> 8) << shift);
shift = (row & 0x01) << 2;
/* Limit to 1 GB space, per the 430NX datasheet. */
regs[drb] = (regs[drb] & ~(0xf << shift)) | (((row_val >> 8) & 3) << shift);
spd_log("SPD: DRB[%d] = %d MB (%02Xh raw)\n", row, size, regs[drb]);
}
}