* Nathan Monson <nmonson@xxxxxxxxx> [081008 13:22]: > 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... OK, pushed this for now until we know if there's a better solution. Tony > > --- > 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 -- 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
