[PATCH] Temporary fix for ethernet rx intr hang issue and Disable cache

[ragunath]

This patch has two changes that are needed for networking to work in BBB.
We disable cache as it is causing random values to be learned in the cpsw Address 
Lookup Engine(ALE) causing tx to fail. Vector enable is done after handler is called by the server task.

---
 c/src/lib/libbsp/arm/beagle/irq.c                 | 2 ++
 c/src/lib/libbsp/arm/beagle/startup/bspstartmmu.c | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/c/src/lib/libbsp/arm/beagle/irq.c b/c/src/lib/libbsp/arm/beagle/irq.c
index c6485cd..64e7756 100644
--- a/c/src/lib/libbsp/arm/beagle/irq.c
+++ b/c/src/lib/libbsp/arm/beagle/irq.c
@@ -73,6 +73,7 @@ void bsp_interrupt_dispatch(void)
 
     _ARMV4_Status_restore(psr);
 
+    if(!(irq == 40 || irq == 41 || irq == 42 || irq == 43))
     bsp_interrupt_vector_enable(irq);
   }
 }
@@ -94,6 +95,7 @@ rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector)
   uint32_t mask, cur;
   uint32_t mir_reg = get_mir_reg(vector, &mask);
 
+  irqs_enabled[vector] = 1;
   cur = mmio_read(omap_intr.base + mir_reg);
   mmio_write(omap_intr.base + mir_reg, cur & ~mask);
   flush_data_cache();
diff --git a/c/src/lib/libbsp/arm/beagle/startup/bspstartmmu.c b/c/src/lib/libbsp/arm/beagle/startup/bspstartmmu.c
index 157edfa..6cd0f38 100644
--- a/c/src/lib/libbsp/arm/beagle/startup/bspstartmmu.c
+++ b/c/src/lib/libbsp/arm/beagle/startup/bspstartmmu.c
@@ -44,15 +44,17 @@ BSP_START_TEXT_SECTION void beagle_setup_mmu_and_cache(void)
 {
   /* turn mmu off first in case it's on */
   uint32_t ctrl = arm_cp15_start_setup_mmu_and_cache(
-    ARM_CP15_CTRL_M | ARM_CP15_CTRL_A,	/* clear - mmu off */
+    ARM_CP15_CTRL_M | ARM_CP15_CTRL_A | ARM_CP15_CTRL_I | ARM_CP15_CTRL_C,	/* clear - mmu off */
     ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_Z
   );
 
-  arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
-    ctrl,
+  arm_cp15_start_setup_translation_table(
     (uint32_t *) bsp_translation_table_base,
     ARM_MMU_DEFAULT_CLIENT_DOMAIN,
     &beagle_mmu_config_table[0],
     RTEMS_ARRAY_SIZE(beagle_mmu_config_table)
   );
+
+  ctrl |= ARM_CP15_CTRL_M;
+  arm_cp15_set_control(ctrl);
 }
-- 
1.9.1