diff options
| author | hpa <hpa> | 1998-12-03 09:06:30 +0000 |
|---|---|---|
| committer | hpa <hpa> | 1998-12-03 09:06:30 +0000 |
| commit | fc83f8c2afc99823e7127ad7dc22efc2d8db55b3 (patch) | |
| tree | 48373cea25f7fb2dfee9634c21581c8ddaa4986c | |
| parent | 6fb6d76a71464bf7e7780e863e1e9e214ffecd26 (diff) | |
| download | syslinux-fc83f8c2afc99823e7127ad7dc22efc2d8db55b3.tar.gz | |
Frob the fast A20 gate as well as the keyboard controller. Prepare for
1.42 prerelease.
| -rw-r--r-- | NEWS | 4 | ||||
| -rw-r--r-- | ldlinux.asm | 18 | ||||
| -rw-r--r-- | version | 2 |
3 files changed, 23 insertions, 1 deletions
@@ -1,3 +1,7 @@ +Changes in 1.42: + * Frob the "fast A20 gate" port as well as the keyboard + controller; will this help systems with problems? + Changes in 1.41: * Don't get confused by directories, volume labels, or VFAT long names. diff --git a/ldlinux.asm b/ldlinux.asm index 8e5d102a..c03e43f1 100644 --- a/ldlinux.asm +++ b/ldlinux.asm @@ -2325,6 +2325,15 @@ bcopy: %define delaytime 256 ; 4 x ISA bus cycles (@ 1.5 µs) enable_a20: +; +; First, enable the "fast A20 gate" +; + in al, 92h + or al,02h + out 92h, al +; +; Second, enable the keyboard controller A20 gate +; call empty_8042 mov al,0D1h ; Command write out 064h, al @@ -2349,6 +2358,15 @@ enable_a20: ret disable_a20: +; +; First, disable the "fast A20 gate" +; + in al, 92h + and al,~02h + out 92h, al +; +; Second, disable the keyboard controller A20 gate +; call empty_8042 mov al,0D1h out 064h, al ; Command write @@ -1 +1 @@ -1.41 +1.42 |