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Add special case on NVR register 0D for VIA 686A/B

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RichardG867
2020-10-13 19:26:29 -03:00
parent 5b9d953f3b
commit 35aedf1ba6
1 changed files with 10 additions and 0 deletions
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10
src/nvr_at.c
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@@ -580,7 +580,17 @@ nvr_reg_write(uint16_t reg, uint8_t val, void *priv)
break; break;
case RTC_REGC: /* R/O */ case RTC_REGC: /* R/O */
break;
case RTC_REGD: /* R/O */ case RTC_REGD: /* R/O */
/* VT82C686A/B have an ACPI register bit controlled by 0D bit 7.
This is overwritten on read, but testing shows BIOSes will
immediately check the ACPI register after writing to this. */
if (local->cent == RTC_CENTURY_VIA) {
nvr->regs[RTC_REGD] &= ~0x80;
if (val & 0x80)
nvr->regs[RTC_REGD] |= 0x80;
}
break; break;
case 0x2e: case 0x2e: