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Re: kern/54560 (PXE netboot regression)
The following reply was made to PR kern/54560; it has been noted by GNATS.
From: Andreas Gustafsson <gson%gson.org@localhost>
To: manu%netbsd.org@localhost (Emmanuel Dreyfus)
Subject: Re: kern/54560 (PXE netboot regression)
Date: Tue, 24 Sep 2019 12:25:02 +0300
Emmanuel Dreyfus wrote:
> I am not sure there are real multiboot + PXE usage. Perhaps we can just
> disable multiboot 2 for PXE without looking further into what the
> problem actually is.
> In case you ar ecurious and want to look into it further, my first hunch
> is that the multiboot 2 code increases the pxeboot_ia32.bin file beyond
> 64kB. You can easily test if this is the problem, remove CPPFLAGS+=
> -DNO_MULTIBOOT2 and instead add
> CPPFLAGS+= -DNO_GPT
> CPPFLAGS+= -DNO_RAIDFRAME
> You will get a pxeboot_ia32.bin below 64 kB with multiboot 2 enabled. If
> that boots, then we have our answer.
That did not boot, but your hunch may be correct anyway. Here's a
summary of my test results, with the size of pxeboot_ia32.bin in each:
Source date CPPFLAGS Size Result
2019.09.13.01.34.19 none 61664 pass
2019.09.13.05.13.54 none 73952 fail
2019.09.22.18.31.59 -DNO_MULTIBOOT2 61664 pass
2019.09.21.15.56.09 -DNO_GPT -DNO_RAIDFRAME 65760 fail
That is, the test failed when and only when pxeboot_ia32.bin was
larger than 65536 bytes.
I guess the next question is, why does multiboot 2 use more space
than GPT and raidframe combined?
Andreas Gustafsson, gson%gson.org@localhost
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