Hi Jiri, Thanks for providing these information. On 11/06/17 at 10:01am, Jiri Bohac wrote: > Hi Baoquan, > > [ 0.000000] memblock_reserve: [0x00000000b8000000-0x00000000bbffffff] gart_iommu_hole_init+0x396/0x4b6 > [ 0.000000] AGP: Mapping aperture over RAM [mem 0xb8000000-0xbbffffff] (65536KB) > ^^^^^ > /proc/iomem: > 00000000-00000fff : Reserved > 00001000-0009d7ff : System RAM > 0009d800-0009ffff : Reserved > 000a0000-000bffff : PCI Bus 0000:00 > 000c0000-000cafff : PCI Bus 0000:00 > 000c0000-000cafff : Video ROM > 000cb000-000ccfff : Adapter ROM > 000ce000-000fffff : Reserved > 000f0000-000fffff : System ROM > 00100000-c7e7ffff : System RAM > 0b000000-0b792eb5 : Kernel code > 0b792eb6-0bd5d47f : Kernel data > 0c274000-0c3c8fff : Kernel bss > b7000000-c6ffffff : Crash kernel It's weird, gart aperture located in crashkernel region? Or we need reserve the low crashkernel memory for gart aperture usage, Just like swiotlb? Sorry, I am not familiar with gart. Thanks Baoquan > c7e80000-c7e8afff : ACPI Tables > c7e8b000-c7e8cfff : ACPI Non-volatile Storage > c7e8d000-c7ffffff : Reserved > c8000000-ce0fffff : PCI Bus 0000:00 > c8000000-c80003ff : IOAPIC 1 > c8014000-c80143ff : 0000:00:11.0 > c8014000-c80143ff : ahci > c8014400-c80144ff : 0000:00:12.2 > c8014400-c80144ff : ehci_hcd
