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Re: [Qemu-devel] [PATCH for-4.0 v4 4/4] i386: allow to load initrd below
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH for-4.0 v4 4/4] i386: allow to load initrd below 4G for recent linux |
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Date: |
Tue, 8 Jan 2019 00:35:26 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 |
On 27/12/18 21:31, Eduardo Habkost wrote:
> All that said, I miss one piece of information here: is
> XLF_CAN_BE_LOADED_ABOVE_4G really supposed to override
> header+0x22c? linux/Documentation/x86/boot.txt isn't clear about
> that. Is there any reference that can help us confirm this?
Linux has supported initrd up to 4 GB for a very long time (2007, long
before XLF_CAN_BE_LOADED_ABOVE_4G which was added in 2013), though it
only sets initrd_max to 2 GB to "work around bootloader bugs". So I
guess the flag can be taken as a hint that you can load at any address,
and perhaps could be renamed.
Paolo