Date: Tue, 24 Jul 2001 16:16:29 -0500 From: Bob Van Valzah <Bob@Talarian.Com> To: John Baldwin <jhb@FreeBSD.org>, Doug Ambrisko <ambrisko@ambrisko.com> Cc: FreeBSD-Mobile@FreeBSD.org Subject: Re: ThinkPad 600X: Can't work out which disk we are booting from Message-ID: <3B5DE5AD.5050202@Talarian.Com> References: <XFMail.010724121327.jhb@FreeBSD.org>
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Doug, Glad you're aware of the problem and have already formulated a fix.
John, I agree that the header file approach might be cleaner.
But here's another idea: Could the "jmp main" at the start of boot1.s be
followed immediately by a "jmp xread"? This'd create a sort of entry
point table at the start of boot1 that could be used by boot2 without
fear of things moving around. But I have to say that I haven't written
any substantial amounts of assembler since the 8080 days (dating myself
there) and I've never looked at the x86 boot sequence, so I may be way
out of my league with this suggestion.
Bob
John Baldwin wrote:
>On 24-Jul-01 Doug Ambrisko wrote:
>
>>Note this is fixed via pr-26382. Which makes IBM ThinkPads & Desktops
>>boot from a FreeBSD bootable CD. The problem is they expect to see
>>a "MS-DOS" type disk header which {Open,Net}BSD and Linux have so things
>>work. FreeBSD does not. I made an 4.3 ISO image with this patch applied
>>to the boot code. Some people on this list have access to that. I did
>>that at my former employer (IBM) they might be able to send you the
>>ISO image. Yes it is a pain on some IBM machine in which it is difficult
>>to have a floppy and CD device attached at the same time.
>>
>
>Robert Nordier has dropped maintainership of the x86 boot blocks, so I'll try
>and look at this PR today or next week. Keep reminding me if I don't get
>around to it. :) Hmm, could you update the patch so instead of patching boot2
>you add a new header file that defines the offset of xread and have that header
>file have a dependecy on ${.OBJDIR}/boot1 and be generated from boot1? I
>think that would be cleaner than patching actual soure code.
>
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Doug, Glad you're aware of the problem and have already formulated a fix.<br>
<br>
John, I agree that the header file approach might be cleaner.<br>
<br>
But here's another idea: Could the "jmp main" at the start of boot1.s be
followed immediately by a "jmp xread"? This'd create a sort of entry point
table at the start of boot1 that could be used by boot2 without fear of things
moving around. But I have to say that I haven't written any substantial amounts
of assembler since the 8080 days (dating myself there) and I've never looked
at the x86 boot sequence, so I may be way out of my league with this suggestion.<br>
<br>
Bob<br>
<br>
John Baldwin wrote:<br>
<blockquote type="cite" cite="mid:XFMail.010724121327.jhb@FreeBSD.org">
<pre wrap="">On 24-Jul-01 Doug Ambrisko wrote:<br></pre>
<blockquote type="cite">
<pre wrap="">Note this is fixed via pr-26382. Which makes IBM ThinkPads & Desktops<br>boot from a FreeBSD bootable CD. The problem is they expect to see<br>a "MS-DOS" type disk header which {Open,Net}BSD and Linux have so things<br>work. FreeBSD does not. I made an 4.3 ISO image with this patch applied <br>to the boot code. Some people on this list have access to that. I did<br>that at my former employer (IBM) they might be able to send you the <br>ISO image. Yes it is a pain on some IBM machine in which it is difficult<br>to have a floppy and CD device attached at the same time.<br></pre>
</blockquote>
<pre wrap=""><!----><br>Robert Nordier has dropped maintainership of the x86 boot blocks, so I'll try<br>and look at this PR today or next week. Keep reminding me if I don't get<br>around to it. :) Hmm, could you update the patch so instead of patching boot2<br>you add a new header file that defines the offset of xread and have that header<br>file have a dependecy on ${.OBJDIR}/boot1 and be generated from boot1? I<br>think that would be cleaner than patching actual soure code.<br><br></pre>
</blockquote>
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