Hi,
I've a few patches for running Linux on the SGI O2:
The first one (O2-asid) concerns the TLB initialization the IP32. The
asid_cache is not initialized, which leads to MMU context = 0 being
considered valid! Thus when switching task, in switch_mm, a new context is
not created. With the patch I can boot a debian experimental system (from
ftp://bolugftp.uni-bonn.de/pub/mips-linux/rootfs/experimental)
The second one adds support for the 16550A UARTs of the O2, so that ARC
console is not needed anymore.
Finaly, with my configuration (SGI O2 R5000 @ 180Mhz) I've to change
PAGE_OFFSET in page.h to the one used for IP22 rather than the one used
for IP32.. here is a third patch (O2-page) to change this, but I'm not
sure about other configurations (R10000?)
regards,
Vivien.
diff -Naur linux/arch/mips64/sgi-ip32/ip32-setup.c linux.patch/arch/mips64/sgi-ip32/ip32-setup.c
--- linux/arch/mips64/sgi-ip32/ip32-setup.c Sun Dec 9 15:47:15 2001
+++ linux.patch/arch/mips64/sgi-ip32/ip32-setup.c Sat Dec 15 22:56:29 2001
@@ -58,6 +58,7 @@
#ifdef CONFIG_SERIAL_CONSOLE
char *ctype;
#endif
+ current_cpu_data.asid_cache = ASID_FIRST_VERSION;
TLBMISS_HANDLER_SETUP ();
#ifdef CONFIG_SERIAL_CONSOLE
diff -Naur linux/arch/mips64/arc/arc_con.c linux.patch/arch/mips64/arc/arc_con.c
--- linux/arch/mips64/arc/arc_con.c Sun Dec 9 15:47:10 2001
+++ linux.patch/arch/mips64/arc/arc_con.c Mon Dec 10 20:35:44 2001
@@ -15,14 +15,7 @@
#include <asm/sgialib.h>
extern void prom_printf (char *, ...);
-
-void prom_putchar(char c)
-{
- ULONG cnt;
- CHAR it = c;
-
- ArcWrite(1, &it, 1, &cnt);
-}
+extern void prom_putchar(char c);
static void prom_console_write(struct console *co, const char *s,
unsigned count)
diff -Naur linux/arch/mips64/arc/console.c linux.patch/arch/mips64/arc/console.c
--- linux/arch/mips64/arc/console.c Sun Dec 9 15:47:10 2001
+++ linux.patch/arch/mips64/arc/console.c Mon Dec 10 20:35:34 2001
@@ -11,6 +11,14 @@
static char ppbuf[1024];
+void prom_putchar(char c)
+{
+ ULONG cnt;
+ CHAR it = c;
+
+ ArcWrite(1, &it, 1, &cnt);
+}
+
void prom_printf(char *fmt, ...)
{
va_list args;
diff -Naur linux/include/asm-mips64/serial.h linux.patch/include/asm-mips64/serial.h
--- linux/include/asm-mips64/serial.h Sun Dec 9 15:52:28 2001
+++ linux.patch/include/asm-mips64/serial.h Mon Dec 10 20:35:08 2001
@@ -18,6 +18,8 @@
*/
#define BASE_BAUD (1843200 / 16)
+#if defined(CONFIG_SGI_IP27)
+
/*
* Note about serial ports and consoles:
* For console output, everyone uses the IOC3 UARTA (offset 0x178)
@@ -49,5 +51,40 @@
#define RS_TABLE_SIZE 64
#define SERIAL_PORT_DFNS
+
+#elif defined(CONFIG_SGI_IP32)
+
+#include <asm/ip32/ip32_ints.h>
+
+/*
+ * The IP32 (SGI O2) has standard serial ports (UART 16550A) mapped in memory
+ */
+
+#define RS_TABLE_SIZE
+
+/* Standard COM flags (except for COM4, because of the 8514 problem) */
+#ifdef CONFIG_SERIAL_DETECT_IRQ
+#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ)
+#define STD_COM4_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_AUTO_IRQ)
+#else
+#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF/* | ASYNC_SKIP_TEST*/)
+#define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF
+#endif
+
+#define SERIAL_PORT_DFNS \
+ { baud_base: BASE_BAUD, \
+ irq: MACEISA_SERIAL1_IRQ, \
+ flags: STD_COM_FLAGS, \
+ iomem_base: (u8*)MACE_BASE+MACEISA_SER1_BASE, \
+ iomem_reg_shift: 8, \
+ io_type: SERIAL_IO_MEM}, \
+ { baud_base: BASE_BAUD, \
+ irq: MACEISA_SERIAL2_IRQ, \
+ flags: STD_COM_FLAGS, \
+ iomem_base: (u8*)MACE_BASE+MACEISA_SER2_BASE, \
+ iomem_reg_shift: 8, \
+ io_type: SERIAL_IO_MEM},
+#endif
+
#endif /* _ASM_SERIAL_H */
diff -Naur linux/include/asm-mips64/page.h linux.patch/include/asm-mips64/page.h
--- linux/include/asm-mips64/page.h Sat Dec 15 21:33:40 2001
+++ linux.patch/include/asm-mips64/page.h Sat Dec 15 21:37:38 2001
@@ -60,10 +60,10 @@
* at XKPHYS for kernels with more than that.
*/
#if defined(CONFIG_SGI_IP22) || defined(CONFIG_MIPS_ATLAS) || \
- defined(CONFIG_MIPS_MALTA)
+ defined(CONFIG_MIPS_MALTA) || defined(CONFIG_SGI_IP32)
#define PAGE_OFFSET 0xffffffff80000000UL
#endif
-#if defined(CONFIG_SGI_IP27) || defined(CONFIG_SGI_IP32)
+#if defined(CONFIG_SGI_IP27)
#define PAGE_OFFSET 0xa800000000000000UL
#endif
