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authorMaarten Lankhorst <m.b.lankhorst@gmail.com>2011-12-16 16:30:58 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2011-12-16 20:34:35 +0400
commit2d2da60fb40a80cc59383121ccf763e0e0e8a42a (patch)
treee0a17e115c545bdf7e065cf0ef53326da70ca407 /arch/x86/boot/compressed/eboot.h
parent291f36325f9f252bd76ef5f603995f37e453fc60 (diff)
downloadlinux-2d2da60fb40a80cc59383121ccf763e0e0e8a42a.tar.xz
x86, efi: Break up large initrd reads
The efi boot stub tries to read the entire initrd in 1 go, however some efi implementations hang if too much if asked to read too much data at the same time. After some experimentation I found out that my asrock p67 board will hang if asked to read chunks of 4MiB, so use a safe value. elilo reads in chunks of 16KiB, but since that requires many read calls I use a value of 1 MiB. hpa suggested adding individual blacklists for when systems are found where this value causes a crash. Signed-off-by: Maarten Lankhorst <m.b.lankhorst@gmail.com> Link: http://lkml.kernel.org/r/4EEB3A02.3090201@gmail.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/boot/compressed/eboot.h')
-rw-r--r--arch/x86/boot/compressed/eboot.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/eboot.h b/arch/x86/boot/compressed/eboot.h
index f66d023e91ef..39251663e65b 100644
--- a/arch/x86/boot/compressed/eboot.h
+++ b/arch/x86/boot/compressed/eboot.h
@@ -12,6 +12,7 @@
#define DESC_TYPE_CODE_DATA (1 << 0)
#define EFI_PAGE_SIZE (1UL << EFI_PAGE_SHIFT)
+#define EFI_READ_CHUNK_SIZE (1024 * 1024)
#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0
#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1