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-rw-r--r--src/mainboard/dell/s1850/auto.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/src/mainboard/dell/s1850/auto.c b/src/mainboard/dell/s1850/auto.c
index ad3619e76d..51bd74bb12 100644
--- a/src/mainboard/dell/s1850/auto.c
+++ b/src/mainboard/dell/s1850/auto.c
@@ -173,8 +173,13 @@ static inline void bmc_foad(void)
}
/* end IPMI garbage */
+
static void main(unsigned long bist)
{
+ u8 b;
+ u16 w;
+ u32 l;
+ int do_reset;
/*
*
*
@@ -191,6 +196,80 @@ static void main(unsigned long bist)
}
};
+ /* using SerialICE, we've seen this basic reset sequence on the dell.
+ * we don't understand it as it uses undocumented registers, but
+ * we're going to clone it.
+ */
+ /* enable a hidden device. */
+ b = pci_read_config8(PCI_DEV(0, 0, 0), 0xf4);
+ b |= 0x8;
+ pci_write_config8(PCI_DEV(0, 0, 0), 0xf4, b);
+
+ /* read-write lock in CMOS on LPC bridge on ICH5 */
+ pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xd8, 4);
+
+ /* operate on undocumented device */
+ l = pci_read_config32(PCI_DEV(0, 0, 2), 0xa4);
+ l |= 0x1000;
+ pci_write_config32(PCI_DEV(0, 0, 2), 0xa4, l);
+
+ l = pci_read_config32(PCI_DEV(0, 0, 2), 0x9c);
+ l |= 0x8000;
+ pci_write_config32(PCI_DEV(0, 0, 2), 0x9c, l);
+
+ /* disable undocumented device */
+ b = pci_read_config8(PCI_DEV(0, 0, 0), 0xf4);
+ b &= ~0x8;
+ pci_write_config8(PCI_DEV(0, 0, 0), 0xf4, b);
+
+ /* set up LPC bridge bits, some of which reply on undocumented
+ * registers
+ */
+
+ b= pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xd8);
+ b |= 4;
+ pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xd8, b);
+
+ b= pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xd4);
+ b |= 2;
+ pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xd4, b);
+
+ /* ACPI base address */
+ pci_write_config16(PCI_DEV(0, 0x1f, 0), 0x40, 0x800);
+
+ /* Enable specific ACPI features */
+ b= pci_read_config8(PCI_DEV(0, 0x1f, 0), 0x44);
+ b |= 0x10;
+ pci_write_config8(PCI_DEV(0, 0x1f, 0), 0x44, b);
+
+ /* ACPI control */
+ w = inw(0x868);
+ outw(w|0x800, 0x868);
+ w = inw(0x866);
+ outw(w|2, 0x866);
+
+ /* SMBUS */
+ pci_write_config16(PCI_DEV(0, 0x1f, 3), 0x20, 0x08c0);
+
+ /* unknown */
+ b = inb(0x8c2);
+ outb(0xdf, 0x8c2);
+
+ /* another device enable? */
+ b = pci_read_config8(PCI_DEV(0, 0, 0), 0xf4);
+ b |= 2;
+ pci_write_config8(PCI_DEV(0, 0, 0), 0xf4, b);
+
+ /* ?? */
+ l = pci_read_config32(PCI_DEV(0, 0, 8), 0xc0);
+ do_reset = l & 0x8000000;
+ l |= 0x8000000;
+ pci_write_config32(PCI_DEV(0, 0, 2), 0xc0, l);
+
+ if (! do_reset) {
+ outb(2, 0xcf9);
+ outb(6, 0xcf9);
+ }
if (bist == 0) {
/* Skip this if there was a built in self test failure */
early_mtrr_init();