On 08/18/06 08:48, Zou, Nanhai wrote: > Hi Horms, > I have little knowledge of the code inside CONFIG_IA64_HP_ZX1.... > I think it stop's IOMMU controller on some HP boxes. Yes, the code is designed to shutdown the IOMMU. The problem we're seeing is if there are sill in-flight DMA transfers happening when we shutdown the IOMMU an MCA will occur. Ring now we're working on a different approach, rather than shutting down the IOMMU completely, we're going to try to update all of the valid pdir entries to point to a single pre-alloced page. This should safely control all of devices with out having to shutdown the IOMMU. > Aziz told me it is necessary to have this code to start up the second kernel. I haven't had a chance to speak with Khalid about this approach. I'm hoping to catch him today. Troy - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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