On Wed, Oct 8, 2008 at 11:36 AM, Nathan Monson <nmonson@xxxxxxxxx> wrote: > "Felipe Contreras" <felipe.contreras@xxxxxxxxx> writes: >> irq -33, desc: c0335cf8, depth: 0, count: 0, unhandled: 0 > > On the BeagleBoard list, Pratheesh Gangadhar said that mapping I/O > regions as Strongly Ordered suppresses this problem: > http://groups.google.com/group/beagleboard/browse_thread/thread/23e1c95b4bfb09b5/70d12dca569ca503?show_docid=70d12dca569ca503 Pratheesh helped me make a patch against the latest linux-omap git to try this. With this patch, my IRQ -33 problems with the DSP have disappeared. Before, I would end up in IRQ -33 loop after 10 invocations of the DSP Bridge 'ping.out' utility. I just finished running it 50,000 times without error. As stated before, this patch is just a workaround for testing purposes, not a fix. Who knows what performance side effects it has... --- diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h index 9eb936e..5cb4f5f 100644 --- a/arch/arm/include/asm/mach/map.h +++ b/arch/arm/include/asm/mach/map.h @@ -25,6 +25,7 @@ struct map_desc { #define MT_HIGH_VECTORS 8 #define MT_MEMORY 9 #define MT_ROM 10 +#define MT_MEMORY_SO 11 #define MT_NONSHARED_DEVICE MT_DEVICE_NONSHARED #define MT_IXP2000_DEVICE MT_DEVICE_IXP2000 diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c index adbe21f..c11c0e8 100644 --- a/arch/arm/mach-omap2/io.c +++ b/arch/arm/mach-omap2/io.c @@ -119,13 +119,13 @@ static struct map_desc omap34xx_io_desc[] __initdata = { .virtual = L3_34XX_VIRT, .pfn = __phys_to_pfn(L3_34XX_PHYS), .length = L3_34XX_SIZE, - .type = MT_DEVICE + .type = MT_MEMORY_SO }, { .virtual = L4_34XX_VIRT, .pfn = __phys_to_pfn(L4_34XX_PHYS), .length = L4_34XX_SIZE, - .type = MT_DEVICE + .type = MT_MEMORY_SO }, { .virtual = L4_WK_34XX_VIRT, @@ -137,19 +137,19 @@ static struct map_desc omap34xx_io_desc[] __initdata = { .virtual = OMAP34XX_GPMC_VIRT, .pfn = __phys_to_pfn(OMAP34XX_GPMC_PHYS), .length = OMAP34XX_GPMC_SIZE, - .type = MT_DEVICE + .type = MT_MEMORY_SO }, { .virtual = OMAP343X_SMS_VIRT, .pfn = __phys_to_pfn(OMAP343X_SMS_PHYS), .length = OMAP343X_SMS_SIZE, - .type = MT_DEVICE + .type = MT_MEMORY_SO }, { .virtual = OMAP343X_SDRC_VIRT, .pfn = __phys_to_pfn(OMAP343X_SDRC_PHYS), .length = OMAP343X_SDRC_SIZE, - .type = MT_DEVICE + .type = MT_MEMORY_SO }, { .virtual = L4_PER_34XX_VIRT, @@ -161,7 +161,7 @@ static struct map_desc omap34xx_io_desc[] __initdata = { .virtual = L4_EMU_34XX_VIRT, .pfn = __phys_to_pfn(L4_EMU_34XX_PHYS), .length = L4_EMU_34XX_SIZE, - .type = MT_DEVICE + .type = MT_MEMORY_SO }, }; #endif diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index a713e40..d5f25ad 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -245,6 +245,10 @@ static struct mem_type mem_types[] = { .prot_sect = PMD_TYPE_SECT, .domain = DOMAIN_KERNEL, }, + [MT_MEMORY_SO] = { + .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_UNCACHED, + .domain = DOMAIN_KERNEL, + }, }; const struct mem_type *get_mem_type(unsigned int type) -- -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
