Route device IRQ through PCI bridge instead in mptable.

Don't enable pin0 for ioapic of io-4.

1. apic error in kernel for MB with mcp55+io55
2. some pcie-cards could have pci bridge there, so need to put entries
   for device under them in mptable.

Signed-off-by: Yinghai Lu <yinghailu@gmail.com>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3112 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Yinghai Lu 2008-02-20 17:41:38 +00:00 committed by Stefan Reinauer
parent 8eff1e3d04
commit f327d9f954
7 changed files with 177 additions and 144 deletions

View File

@ -248,6 +248,10 @@ void smp_write_intsrc(struct mp_config_table *mc,
unsigned char irqtype, unsigned short irqflag,
unsigned char srcbus, unsigned char srcbusirq,
unsigned char dstapic, unsigned char dstirq);
void smp_write_intsrc_pci_bridge(struct mp_config_table *mc,
unsigned char irqtype, unsigned short irqflag,
struct device *dev,
unsigned char dstapic, unsigned char *dstirq);
void smp_write_lintsrc(struct mp_config_table *mc,
unsigned char irqtype, unsigned short irqflag,
unsigned char srcbusid, unsigned char srcbusirq,

View File

@ -1,6 +1,7 @@
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <device/pci_ids.h>
#include <cpu/cpu.h>
#include <arch/smp/mpspec.h>
#include <string.h>
@ -26,8 +27,7 @@ void *smp_write_floating_table(unsigned long addr)
void *v;
/* 16 byte align the table address */
addr += 15;
addr &= ~15;
addr = (addr + 0xf) & (~0xf);
v = (void *)addr;
mf = v;
@ -204,6 +204,58 @@ void smp_write_intsrc(struct mp_config_table *mc,
#endif
}
void smp_write_intsrc_pci_bridge(struct mp_config_table *mc,
unsigned char irqtype, unsigned short irqflag,
struct device *dev,
unsigned char dstapic, unsigned char *dstirq)
{
struct device *child;
int linkn;
int i;
int srcbus;
int slot;
struct bus *link;
unsigned char dstirq_x[4];
for (linkn = 0; linkn < dev->links; linkn++) {
link = &dev->link[linkn];
child = link->children;
srcbus = link->secondary;
while (child) {
if (child->path.type != DEVICE_PATH_PCI)
goto next;
slot = (child->path.u.pci.devfn >> 3);
/* round pins */
for (i = 0; i < 4; i++)
dstirq_x[i] = dstirq[(i + slot) % 4];
if ((child->class >> 16) != PCI_BASE_CLASS_BRIDGE) {
/* pci device */
printk_debug("route irq: %s %04x\n", dev_path(child));
for (i = 0; i < 4; i++)
smp_write_intsrc(mc, irqtype, irqflag, srcbus, (slot<<2)|i, dstapic, dstirq_x[i]);
goto next;
}
switch (child->class>>8) {
case PCI_CLASS_BRIDGE_PCI:
case PCI_CLASS_BRIDGE_PCMCIA:
case PCI_CLASS_BRIDGE_CARDBUS:
printk_debug("route irq bridge: %s %04x\n", dev_path(child));
smp_write_intsrc_pci_bridge(mc, irqtype, irqflag, child, dstapic, dstirq_x);
}
next:
child = child->sibling;
}
}
}
void smp_write_lintsrc(struct mp_config_table *mc,
unsigned char irqtype, unsigned short irqflag,

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@ -98,7 +98,8 @@ void get_bus_conf(void)
device_t dev;
int i, j;
if(get_bus_conf_done==1) return; //do it only once
if (get_bus_conf_done)
return; //do it only once
get_bus_conf_done = 1;
@ -122,70 +123,34 @@ void get_bus_conf(void)
m->bus_type[0] = 1; //pci
m->bus_mcp55[0] = (sysconf.pci1234[0] >> 16) & 0xff;
/* MCP55 */
dev = dev_find_slot(m->bus_mcp55[0], PCI_DEVFN(sysconf.sbdn + 0x06,0));
if (dev) {
m->bus_mcp55[1] = pci_read_config8(dev, PCI_SECONDARY_BUS);
}
else {
printk_debug("ERROR - could not find PCI 1:%02x.0, using defaults\n", sysconf.sbdn + 0x06);
}
for(i=2; i<8;i++) {
dev = dev_find_slot(m->bus_mcp55[0], PCI_DEVFN(sysconf.sbdn + 0x0a + i - 2 , 0));
if (dev) {
m->bus_mcp55[i] = pci_read_config8(dev, PCI_SECONDARY_BUS);
}
else {
printk_debug("ERROR - could not find PCI %02x:%02x.0, using defaults\n", m->bus_mcp55[0], sysconf.sbdn + 0x0a + i - 2 );
}
}
if(m->bus_mcp55[2]) {
for(i=0;i<2; i++) {
dev = dev_find_slot(m->bus_mcp55[2], PCI_DEVFN(0, i));
if(dev) {
m->bus_pcix[0] = m->bus_mcp55[2];
m->bus_pcix[i+1] = pci_read_config8(dev, PCI_SECONDARY_BUS);
}
}
}
m->bus_mcp55 = (sysconf.pci1234[0] >> 16) & 0xff;
for (i = 0; i < sysconf.hc_possible_num; i++) {
if(!(sysconf.pci1234[i] & 0x1) ) continue;
unsigned busn_min, busn_max;
unsigned busn = (sysconf.pci1234[i] >> 16) & 0xff;
unsigned busn_max = (sysconf.pci1234[i] >> 24) & 0xff;
for (j = busn; j <= busn_max; j++)
if (!(sysconf.pci1234[i] & 0x1))
continue;
busn_min = (sysconf.pci1234[i] >> 16) & 0xff;
busn_max = (sysconf.pci1234[i] >> 24) & 0xff;
for (j = busn_min; j <= busn_max; j++)
m->bus_type[j] = 1;
if(m->bus_isa <= busn_max)
m->bus_isa = busn_max + 1;
printk_debug("i=%d bus range: [%x, %x] bus_isa=%x\n",i, busn, busn_max, m->bus_isa);
printk_debug("i=%d bus range: [%x, %x] bus_isa=%x\n",i, busn_min, busn_max, m->bus_isa);
}
/* MCP55b */
for (i = 1; i < sysconf.hc_possible_num; i++) {
if (!(sysconf.pci1234[i] & 0x0f) ) continue;
if (!(sysconf.pci1234[i] & 0x0f))
continue;
// check hcid type here
sysconf.hcid[i] = get_hcid(i);
if (!sysconf.hcid[i]) continue; //unknown co processor
if (!sysconf.hcid[i])
continue; //unknown co processor
m->bus_mcp55b[0] = (sysconf.pci1234[1]>>16) & 0xff;
m->bus_mcp55b[1] = m->bus_mcp55b[0]+1; //fake pci
for(i=2; i<8;i++) {
dev = dev_find_slot(m->bus_mcp55b[0], PCI_DEVFN(m->sbdnb + 0x0a + i - 2 , 0));
if (dev) {
m->bus_mcp55b[i] = pci_read_config8(dev, PCI_SECONDARY_BUS);
m->bus_mcp55b = (sysconf.pci1234[1]>>16) & 0xff;
}
else {
printk_debug("ERROR - could not find PCI %02x:%02x.0, using defaults\n", m->bus_mcp55b[0], m->sbdnb + 0x0a + i - 2 );
}
}
}
/*I/O APICs: APIC ID Version State Address*/
#if CONFIG_LOGICAL_CPUS==1

View File

@ -82,7 +82,7 @@ unsigned long write_pirq_routing_table(unsigned long addr)
pirq->signature = PIRQ_SIGNATURE;
pirq->version = PIRQ_VERSION;
pirq->rtr_bus = m->bus_mcp55[0];
pirq->rtr_bus = m->bus_mcp55;
pirq->rtr_devfn = ((sbdn+6)<<3)|0;
pirq->exclusive_irqs = 0;
@ -97,7 +97,7 @@ unsigned long write_pirq_routing_table(unsigned long addr)
pirq_info = (void *) ( &pirq->checksum + 1);
slot_num = 0;
//pci bridge
write_pirq_info(pirq_info, m->bus_mcp55[0], ((sbdn+6)<<3)|0, 0x1, 0xdef8, 0x2, 0xdef8, 0x3, 0xdef8, 0x4, 0xdef8, 0, 0);
write_pirq_info(pirq_info, m->bus_mcp55, ((sbdn+6)<<3)|0, 0x1, 0xdef8, 0x2, 0xdef8, 0x3, 0xdef8, 0x4, 0xdef8, 0, 0);
pirq_info++; slot_num++;
for (i = 1; i < sysconf.hc_possible_num; i++) {

View File

@ -24,12 +24,11 @@
struct mb_sysconf_t {
unsigned char bus_isa;
unsigned char bus_mcp55[8]; //1
unsigned char bus_mcp55b[8];//a
unsigned char bus_mcp55;
unsigned char bus_mcp55b;
unsigned apicid_mcp55;
unsigned apicid_mcp55b;
unsigned bus_type[256];
unsigned char bus_pcix[3]; // under bus_mcp55_2
unsigned sbdnb;

View File

@ -39,6 +39,7 @@ void *smp_write_config_table(void *v)
unsigned sbdn;
int i,j;
unsigned char apicpin[4];
mc = (void *)(((char *)v) + SMP_FLOATING_TABLE_LEN);
memset(mc, 0, sizeof(*mc));
@ -77,12 +78,17 @@ void *smp_write_config_table(void *v)
struct resource *res;
uint32_t dword;
dev = dev_find_slot(m->bus_mcp55[0], PCI_DEVFN(sbdn+ 0x1,0));
dev = dev_find_slot(m->bus_mcp55, PCI_DEVFN(sbdn+ 0x1,0));
if (dev) {
res = find_resource(dev, PCI_BASE_ADDRESS_1);
if (res) {
if (res)
smp_write_ioapic(mc, m->apicid_mcp55, 0x11, res->base);
}
/* Initialize interrupt mapping*/
dword = pci_read_config32(dev, 0x74);
dword &= ~(1<<15);
dword |= 1<<2;
pci_write_config32(dev, 0x74, dword);
dword = 0x43c6c643;
pci_write_config32(dev, 0x7c, dword);
@ -95,13 +101,13 @@ void *smp_write_config_table(void *v)
}
if(m->bus_mcp55b[0]) {
dev = dev_find_slot(m->bus_mcp55b[0], PCI_DEVFN(m->sbdnb + 0x1,0));
if (m->bus_mcp55b) {
dev = dev_find_slot(m->bus_mcp55b, PCI_DEVFN(m->sbdnb + 0x1,0));
if (dev) {
res = find_resource(dev, PCI_BASE_ADDRESS_1);
if (res) {
if (res)
smp_write_ioapic(mc, m->apicid_mcp55b, 0x11, res->base);
}
dword = 0x43c60000;
pci_write_config32(dev, 0x7c, dword);
@ -131,64 +137,66 @@ void *smp_write_config_table(void *v)
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_EDGE|MP_IRQ_POLARITY_HIGH, m->bus_isa, 0xe, m->apicid_mcp55, 0xe);
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_EDGE|MP_IRQ_POLARITY_HIGH, m->bus_isa, 0xf, m->apicid_mcp55, 0xf);
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+1)<<2)|1, m->apicid_mcp55, 0xa);
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+1)<<2)|1, m->apicid_mcp55, 0xa); // 10
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+2)<<2)|0, m->apicid_mcp55, 0x16); // 22
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+2)<<2)|0, m->apicid_mcp55, 0x16); // 22
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+2)<<2)|1, m->apicid_mcp55, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+2)<<2)|1, m->apicid_mcp55, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+6)<<2)|1, m->apicid_mcp55, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+6)<<2)|1, m->apicid_mcp55, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+5)<<2)|0, m->apicid_mcp55, 0x14); // 20
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+5)<<2)|1, m->apicid_mcp55, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+5)<<2)|2, m->apicid_mcp55, 0x15); // 21
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+5)<<2)|0, m->apicid_mcp55, 0x14); // 20
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+5)<<2)|1, m->apicid_mcp55, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+5)<<2)|2, m->apicid_mcp55, 0x15); // 21
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+8)<<2)|0, m->apicid_mcp55, 0x16); // 22
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[0], ((sbdn+9)<<2)|0, m->apicid_mcp55, 0x15); // 21
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+8)<<2)|0, m->apicid_mcp55, 0x16); // 22
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55, ((sbdn+9)<<2)|0, m->apicid_mcp55, 0x15); // 21
for(j=7; j>=2; j--) {
if(!m->bus_mcp55[j]) continue;
//Slot PCIE
for (j = 2; j < 8; j++) {
device_t dev;
dev = dev_find_slot(m->bus_mcp55, PCI_DEVFN(sbdn + 0x0a + j - 2 , 0));
if (!dev || !dev->enabled)
continue;
for (i = 0; i < 4; i++)
apicpin[i] = 0x10 + (2+j+i+4-sbdn%4)%4;
smp_write_intsrc_pci_bridge(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, dev, m->apicid_mcp55, apicpin);
}
//Slot PCI 32
{
device_t dev;
dev = dev_find_slot(m->bus_mcp55, PCI_DEVFN(sbdn + 6 , 0));
if (dev && dev->enabled) {
for (i = 0; i < 4; i++)
apicpin[i] = 0x10 + (2+i)%4;
smp_write_intsrc_pci_bridge(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, dev, m->apicid_mcp55, apicpin);
}
}
if (m->bus_mcp55b) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b, ((m->sbdnb+5)<<2)|0, m->apicid_mcp55b, 0x14); // 20
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b, ((m->sbdnb+5)<<2)|1, m->apicid_mcp55b, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b, ((m->sbdnb+5)<<2)|2, m->apicid_mcp55b, 0x15); // 21
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b, ((m->sbdnb+8)<<2)|0, m->apicid_mcp55b, 0x16); // 22
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b, ((m->sbdnb+9)<<2)|0, m->apicid_mcp55b, 0x15); // 21
//Slot PCIE
for (j = 2; j < 8; j++) {
device_t dev;
dev = dev_find_slot(m->bus_mcp55b, PCI_DEVFN(m->sbdnb + 0x0a + j - 2 , 0));
if (!dev || !dev->enabled)
continue;
for (i = 0; i < 4; i++) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[j], (0x00<<2)|i, m->apicid_mcp55, 0x10 + (2+j+i+4-sbdn%4)%4);
apicpin[i] = 0x10 + (2+j+i+4-m->sbdnb%4)%4;
}
smp_write_intsrc_pci_bridge(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, dev, m->apicid_mcp55b, apicpin);
}
for(j=0; j<2; j++)
for(i=0;i<4;i++) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55[1], ((0x06+j)<<2)|i, m->apicid_mcp55, 0x10 + (2+i+j)%4);
}
if(m->bus_mcp55b[0]) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b[0], ((m->sbdnb+5)<<2)|0, m->apicid_mcp55b, 0x14); // 20
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b[0], ((m->sbdnb+5)<<2)|1, m->apicid_mcp55b, 0x17); // 23
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b[0], ((m->sbdnb+5)<<2)|2, m->apicid_mcp55b, 0x15); // 21
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b[0], ((m->sbdnb+8)<<2)|0, m->apicid_mcp55b, 0x16); // 22
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b[0], ((m->sbdnb+9)<<2)|0, m->apicid_mcp55b, 0x15); // 21
for(j=7; j>=2; j--) {
if(!m->bus_mcp55b[j]) continue;
for(i=0;i<4;i++) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_mcp55b[j], (0x00<<2)|i, m->apicid_mcp55b, 0x10 + (2+j+i+4-m->sbdnb%4)%4);
}
}
}
#if 1
if(m->bus_pcix[0]) {
for(i=0;i<2;i++) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_pcix[2], (4<<2)|i, m->apicid_mcp55, 0x10 + (0+i+4-sbdn%4)%4); //16, 17
}
for(i=0;i<4;i++) {
smp_write_intsrc(mc, mp_INT, MP_IRQ_TRIGGER_LEVEL|MP_IRQ_POLARITY_LOW, m->bus_pcix[1], (4<<2)|i, m->apicid_mcp55, 0x10 + (2+i+4-sbdn%4)%4); // 18, 19, 16, 17
}
}
#endif
/*Local Ints: Type Polarity Trigger Bus ID IRQ APIC ID PIN#*/
smp_write_intsrc(mc, mp_ExtINT, MP_IRQ_TRIGGER_EDGE|MP_IRQ_POLARITY_HIGH, m->bus_isa, 0x0, MP_APIC_ALL, 0x0);
smp_write_intsrc(mc, mp_NMI, MP_IRQ_TRIGGER_EDGE|MP_IRQ_POLARITY_HIGH, m->bus_isa, 0x0, MP_APIC_ALL, 0x1);

View File

@ -87,7 +87,7 @@ static struct ioapicreg ioapicregvalues[] = {
/* Be careful and don't write past the end... */
};
static void setup_ioapic(unsigned long ioapic_base)
static void setup_ioapic(unsigned long ioapic_base, int master)
{
int i;
unsigned long value_low, value_high;
@ -95,7 +95,14 @@ static void setup_ioapic(unsigned long ioapic_base)
volatile unsigned long *l;
struct ioapicreg *a = ioapicregvalues;
if (master) {
ioapicregvalues[0].value_high = lapicid()<<(56-32);
ioapicregvalues[0].value_low = ENABLED | TRIGGER_EDGE | POLARITY_HIGH | PHYSICAL_DEST | ExtINT;
}
else {
ioapicregvalues[0].value_high = NONE;
ioapicregvalues[0].value_low = DISABLED;
}
l = (unsigned long *) ioapic_base;
@ -128,7 +135,7 @@ static void setup_ioapic(unsigned long ioapic_base)
#define MAINBOARD_POWER_ON_AFTER_POWER_FAIL MAINBOARD_POWER_ON
#endif
static void lpc_common_init(device_t dev)
static void lpc_common_init(device_t dev, int master)
{
uint8_t byte;
uint32_t dword;
@ -139,13 +146,12 @@ static void lpc_common_init(device_t dev)
pci_write_config8(dev, 0x74, byte);
dword = pci_read_config32(dev, PCI_BASE_ADDRESS_1); // 0x14
setup_ioapic(dword);
setup_ioapic(dword, master);
}
static void lpc_slave_init(device_t dev)
{
lpc_common_init(dev);
lpc_common_init(dev, 0);
}
#if 0
@ -166,13 +172,12 @@ static void lpc_init(device_t dev)
int on;
int nmi_option;
lpc_common_init(dev);
lpc_common_init(dev, 1);
#if 0
/* posted memory write enable */
byte = pci_read_config8(dev, 0x46);
pci_write_config8(dev, 0x46, byte | (1<<0));
#endif
/* power after power fail */