* Nathan Monson <[EMAIL PROTECTED]> [081008 13:22]:
> On Wed, Oct 8, 2008 at 11:36 AM, Nathan Monson <[EMAIL PROTECTED]> wrote:
> > "Felipe Contreras" <[EMAIL PROTECTED]> 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)
> --
> --
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