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-rw-r--r--src/include/pc80/mc146818rtc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h
index 78184214a3..701cc73af8 100644
--- a/src/include/pc80/mc146818rtc.h
+++ b/src/include/pc80/mc146818rtc.h
@@ -33,6 +33,8 @@
# define RTC_REF_CLCK_4MHZ 0x00
# define RTC_REF_CLCK_1MHZ 0x10
# define RTC_REF_CLCK_32KHZ 0x20
+ /* In AMD BKDG, bit 4 is DV0 bank selection. Bits 5 and 6 are reserved. */
+# define RTC_AMD_BANK_SELECT 0x10
/* 2 values for divider stage reset, others for "testing purposes only" */
# define RTC_DIV_RESET1 0x60
# define RTC_DIV_RESET2 0x70