Messages in this thread | | | Date | Fri, 21 Dec 2012 21:42:25 -0500 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G |
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On Mon, Dec 17, 2012 at 11:15:32PM -0800, Yinghai Lu wrote: > Now we have limit kdump reseved under 896M, because kexec has the limitation. > and also bzImage need to stay under 4g. > > To make kexec/kdump could use range above 4g, we need to make bzImage and > ramdisk could be loaded above 4g. > During booting bzImage will be unpacked on same postion and stay high. > > The patches add fields in setup_header and boot_params to > 1. get info about ramdisk position info above 4g from bootloader/kexec > 2. get info about cmd_line_ptr info above 4g from bootloader/kexec > 3. set xloadflags bit0 in header for bzImage and bootloader/kexec load > could check that to decide if it could to put bzImage high. > 4. use sentinel to make sure ext_* fields in boot_params could be used. > > This patches is tested with kexec tools with local changes and they are sent > to kexec list later. > > could be found at: > > git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-x86-boot
Did a light test and it looks to work under Xen - thought I had not tested any various configuration of memory layouts.
More worryingly it blew up under native under an Dell T105 AMD box with 4GB of memory. I can't get it even to print anything on the serial log:
(this is an excerpt from pxelinux.cfg/C0A8 file) LABEL BAREMETAL KERNEL vmlinuz APPEND initrd=initramfs.cpio.gz debug selinux=0 loglevel=10 apic=debug console=uart8250,115200n8
PXELINUX 3.82 2009-06-09 Copyright (C) 1994-2009 H. Peter Anvin et al Loading vmlinuz....................................................................... Loading initramfs.cpio.gz............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. ........................................................................................................................................................................................................................................................................................ready.
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