Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G

[H. Peter Anvin]

Earlyprintk please?

Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:

>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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