John, > When I use the reboot command on my Dorado demo board from National > (with their BIOS), It will successfully warm boot the machine. When I > use my LinuxBIOS image on the Dorado or my Geode machine, the machine > just stalls at the point where the reset should occur. It seems to me > that Linux is performing a BIOS Int function that is not implemented in > my build of LinuxBIOS. Anyone had any luck with this? Kenerl doesn't support it by default. Basically you need to add a reset routine for cs5530. Here is my patch which works for me. It is for 2.4.17, but shouldn't be too hard to patch it on 2.4.20.
-Andrew -- Andrew Ip Email: [EMAIL PROTECTED] Tel: (852) 2542 2046 Fax: (852) 2542 2036 Mobile: (852) 9201 9866 Cwlinux Limited Unit 202B 2/F Lai Cheong Factory Building, 479-479A Castle Peak Road, Lai Chi Kok, Kowloon, Hong Kong. Tel: (852)2542 2046 Fax: (852)2542 2036 For public pgp key, please obtain it from http://www.keyserver.net/en.
diff -Nur linux/arch/i386/kernel/process.c linux-geode.reset/arch/i386/kernel/process.c
--- linux/arch/i386/kernel/process.c Fri Oct 5 09:42:54 2001
+++ linux-geode.reset/arch/i386/kernel/process.c Fri Jul 19 15:17:49 2002
@@ -49,6 +49,153 @@
#include <linux/irq.h>
+#define CONFIG_LINUXBIOS_PM
+#ifdef CONFIG_LINUXBIOS_PM
+#include <linux/pci.h>
+void
+cs5530_reset(struct pci_dev *dev)
+{
+ struct pci_dev *dev;
+
+ printk(KERN_ERR __FUNCTION__ ": starting reset operation. \n");
+
+ dev = pci_find_device(PCI_VENDOR_ID_CYRIX, \
+ PCI_DEVICE_ID_CYRIX_5530_LEGACY, 0);
+
+ if (dev == NULL) {
+ printk(KERN_ERR __FUNCTION__ ": can't find device!!!\n");
+ }
+
+ /* Execute system wide reset by doing X-Bus Warm Start*/
+ pci_write_config_byte(dev, 0x44, 0x1);
+
+ printk(KERN_ERR __FUNCTION__ ": We should reset soon. \n");
+}
+
+void
+sis503_reset(struct pci_dev *dev)
+{
+ unsigned char b;
+ unsigned short acpi_base;
+
+ printk(KERN_ERR __FUNCTION__ ": starting reset operation. \n");
+
+ /* Enable ACPI by set B7 on Reg 0x40, LPC */
+ pci_read_config_byte(dev, 0x40, &b);
+ pci_write_config_byte(dev, 0x40, b | 0x80);
+ printk(KERN_ERR __FUNCTION__ ": enabled ACPI. \n");
+
+ /* get the ACPI base address for register 0x74,0x75 of LPC */
+ pci_read_config_word(dev, 0x74, &acpi_base);
+ printk(KERN_ERR __FUNCTION__ ":acpi base: %x\n", acpi_base);
+
+ /* Set software watchdog timer init value */
+ outb(0x03, 0x4a + acpi_base);
+ printk(KERN_ERR __FUNCTION__ ": set the dog. \n");
+
+ printk(KERN_ERR __FUNCTION__ ": enabling dog. \n");
+ /* Software watchdog enable, issue PCIRST# when time expire */
+ outb(0x8f, 0x4b + acpi_base);
+
+ printk(KERN_ERR __FUNCTION__ ": We should reset soon. \n");
+}
+
+void
+sis503_off(struct pci_dev *dev)
+{
+ unsigned char b;
+ unsigned short acpi_base;
+
+ printk(KERN_ERR __FUNCTION__ ": starting reset operation. \n");
+ /* Enable ACPI by set B7 on Reg 0x40, LPC */
+ pci_read_config_byte(dev, 0x40, &b);
+ pci_write_config_byte(dev, 0x40, b | 0x80);
+ printk(KERN_ERR __FUNCTION__ ": enabled ACPI. \n");
+
+ /* get the ACPI base address for register 0x74,0x75 of LPC */
+ pci_read_config_word(dev, 0x74, &acpi_base);
+ printk (KERN_ERR __FUNCTION__ ":acpi base: %x\n", acpi_base);
+
+ /* ACPI Register 5, Bit 10-12, Sleeping Type,
+ set to 101 -> S5, soft_off */
+ outb(0x14, 0x05 + acpi_base);
+ printk(KERN_ERR __FUNCTION__ ": DONE setting sleep type. \n");
+
+ /* ACPI Register 5, Bit 13, Sleep Enable */
+ outb(0x20 | 0x14, 0x05 + acpi_base);
+ printk(KERN_ERR __FUNCTION__ ": DONE sleep enable. \n");
+}
+
+struct pci_dev * pci_find_device(unsigned int vendor, unsigned int device,
+ const struct pci_dev *from);
+
+struct linuxbios_control {
+ u_short vendor, device;
+ void (*poweroff)(struct pci_dev *);
+ void (*reset)(struct pci_dev *);
+};
+
+struct linuxbios_control controls[] = {
+ {PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503, sis503_off, sis503_reset},
+ {PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_LEGACY, NULL, cs5530_reset}
+};
+
+struct linuxbios_control *findcontrol(struct pci_dev **d)
+{
+ struct linuxbios_control *lb = controls, *retval = 0;
+ int i;
+
+ printk(KERN_ERR __FUNCTION__ ": Find vendor 0x%x device 0x%x\n",
+ lb->vendor, lb->device);
+ for(lb = controls, i = 0;
+ (i < sizeof(controls)/sizeof(controls[0])) && (! retval);
+ i++, lb++)
+ {
+ *d = pci_find_device(lb->vendor, lb->device, 0);
+ if (*d)
+ retval = lb;
+ }
+
+ printk(KERN_ERR __FUNCTION__ ": result of find is %p\n", retval);
+ return retval;
+}
+
+void
+linuxbios_poweroff(void)
+{
+ struct linuxbios_control *lb = 0;
+ struct pci_dev *dev;
+
+ printk(KERN_ERR __FUNCTION__ ": find an lb\n");
+ lb = findcontrol(&dev);
+
+ printk(KERN_ERR __FUNCTION__ ": found lb %p, call %p\n",
+ lb, lb ? lb->poweroff : 0);
+ if (lb && (lb->poweroff))
+ lb->poweroff(dev);
+ printk(KERN_ERR __FUNCTION__ ": Returning? Can't happen, I thought?\n");
+}
+
+void
+linuxbios_reset(void)
+{
+ struct linuxbios_control *lb = 0;
+ struct pci_dev *dev;
+
+ printk(KERN_ERR __FUNCTION__ ": find an lb\n");
+ lb = findcontrol(&dev);
+
+ printk(KERN_ERR __FUNCTION__ ": found lb %p, call %p\n",
+ lb, lb ? lb->reset : 0);
+ if (lb && (lb->reset))
+ lb->reset(dev);
+
+ printk(KERN_ERR __FUNCTION__ ": Returning? Can't happen, I thought?\n");
+}
+
+#endif
+
+
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
int hlt_counter;
@@ -399,6 +546,9 @@
*/
smp_send_stop();
disable_IO_APIC();
+#endif
+#ifdef CONFIG_LINUXBIOS_PM
+ linuxbios_reset();
#endif
if(!reboot_thru_bios) {
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