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According to the description in datasheet of f71889, 

"To enable configuration, the entry key 0x87 must be written to
the index port"

"
 -o 4e 87
 -o 4e 87	(enable configuration)
 -o 4e aa	(disable configuration)
"
This piece of text appears in most of the datasheet of fintek superio.
It doesnt say it quite clear, but it seems that the 0x87 should
be written twice. I tried on f81865, which is not in the coreboot tree
yet. If the 0x87 is only written once, you can only R/W the index/data
port once. All the subsequent RW will fail. Writing twice will be ok.

Plus, in the superiotool, the function enter_conf_mode_winbond_fintek_ite_8787
also write 8787.

The fintek superio chips seem to enable the UART automatically when the
power is on. So I didnt find it failed to access.

Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6025 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Zheng Bao 2010-11-05 07:59:06 +00:00 committed by Zheng Bao
parent 0e40e6ba4d
commit 27770c93d4
4 changed files with 4 additions and 0 deletions
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1
src/superio/fintek/f71805f/f71805f_early_serial.c
View File

@ -27,6 +27,7 @@ static void pnp_enter_conf_state(device_t dev)
{ {
u16 port = dev >> 8; u16 port = dev >> 8;
outb(0x87, port); outb(0x87, port);
outb(0x87, port);
} }
static void pnp_exit_conf_state(device_t dev) static void pnp_exit_conf_state(device_t dev)

1
src/superio/fintek/f71859/f71859_early_serial.c
View File

@ -27,6 +27,7 @@ static void pnp_enter_conf_state(device_t dev)
{ {
u16 port = dev >> 8; u16 port = dev >> 8;
outb(0x87, port); outb(0x87, port);
outb(0x87, port);
} }
static void pnp_exit_conf_state(device_t dev) static void pnp_exit_conf_state(device_t dev)

1
src/superio/fintek/f71863fg/f71863fg_early_serial.c
View File

@ -27,6 +27,7 @@ static void pnp_enter_conf_state(device_t dev)
{ {
u16 port = dev >> 8; u16 port = dev >> 8;
outb(0x87, port); outb(0x87, port);
outb(0x87, port);
} }
static void pnp_exit_conf_state(device_t dev) static void pnp_exit_conf_state(device_t dev)

1
src/superio/fintek/f71889/f71889_early_serial.c
View File

@ -26,6 +26,7 @@ static void pnp_enter_conf_state(device_t dev)
{ {
u16 port = dev >> 8; u16 port = dev >> 8;
outb(0x87, port); outb(0x87, port);
outb(0x87, port);
} }
static void pnp_exit_conf_state(device_t dev) static void pnp_exit_conf_state(device_t dev)