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nixpkgs/pkgs/applications/virtualization/xen/0000-qemu-seabios-enable-ATA_DMA.patch

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diff -uNr a/src/Kconfig b/src/Kconfig
--- a/src/Kconfig 2015-08-31 10:15:13.231134858 +0200
+++ b/src/Kconfig 2015-08-31 10:14:24.039180178 +0200
@@ -144,13 +144,13 @@
config ATA_DMA
depends on ATA
bool "ATA DMA"
- default n
+ default y
help
Detect and try to use ATA bus mastering DMA controllers.
config ATA_PIO32
depends on ATA
bool "ATA 32bit PIO"
- default n
+ default y
help
Use 32bit PIO accesses on ATA (minor optimization on PCI transfers).
config AHCI