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

[Yinghai Lu]

On Fri, Dec 21, 2012 at 6:42 PM, 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

that points to -v8.

>
> 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:

boot log with working kernel ?

>
> (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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