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-rw-r--r--target/linux/malta/patches-3.6/001-MIPS-fix-CBUS-UART-irq.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/target/linux/malta/patches-3.6/001-MIPS-fix-CBUS-UART-irq.patch b/target/linux/malta/patches-3.6/001-MIPS-fix-CBUS-UART-irq.patch
new file mode 100644
index 0000000000..93f93a79f2
--- /dev/null
+++ b/target/linux/malta/patches-3.6/001-MIPS-fix-CBUS-UART-irq.patch
@@ -0,0 +1,39 @@
+From 132a7253fe87b1f4d71aab5abee3108a793234db Mon Sep 17 00:00:00 2001
+From: Ralf Baechle <ralf@linux-mips.org>
+Date: Tue, 13 Nov 2012 10:41:50 +0100
+Subject: [PATCH] MIPS: Malta: Fix interupt number of CBUS UART.
+
+The CBUS UART's interrupt number was wrong conflicting with the interrupt
+being tied to the Intel PIIX4. Since the PIIX4's interrupt is registered
+before the CBUS UART which is not being used on most systems this would
+not be noticed.
+
+Attempts to open the ttyS2 CBUS UART would result in:
+
+genirq: Flags mismatch irq 18. 00000000 (serial) vs. 00010000 (XT-PIC cascade)
+serial_link_irq_chain: request failed: -16 for irq: 18
+
+Qemu was written to match the kernel so will need to be fixed also.
+
+Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+(cherry picked from commit fe2ccd4dcebd3c5e264af1705bb9b659972418cc)
+---
+ arch/mips/mti-malta/malta-platform.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/mips/mti-malta/malta-platform.c b/arch/mips/mti-malta/malta-platform.c
+index a8beca8..a906153 100644
+--- a/arch/mips/mti-malta/malta-platform.c
++++ b/arch/mips/mti-malta/malta-platform.c
+@@ -47,7 +47,7 @@ static struct plat_serial8250_port uart8250_data[] = {
+ SMC_PORT(0x2F8, 3),
+ {
+ .mapbase = 0x1f000900, /* The CBUS UART */
+- .irq = MIPS_CPU_IRQ_BASE + 2,
++ .irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB2,
+ .uartclk = 3686400, /* Twice the usual clk! */
+ .iotype = UPIO_MEM32,
+ .flags = CBUS_UART_FLAGS,
+--
+1.7.11.7
+