[syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e. pre-UEFI) systems

[Gerardo Exequiel Pozzi]

On 11/26/2013 01:14 AM, H. Peter Anvin wrote:
> On 11/25/2013 06:32 PM, H. Peter Anvin wrote:
>> On 11/25/2013 04:12 PM, Gerardo Exequiel Pozzi wrote:
>>>
>>> I made some more and more experiments beyond LBA 65535
>>>
>>> Works: * isolinux-4.07.bin (size 24574) * isolinux-5.00.bin (size
>>> 34816)
>>>
>>> Does not work: * isolinux-5.01.bin (size 34816) * isolinux-5.10.bin
>>> (size 36864) * isolinux-6.00.bin (size 38912) * isolinux-6.02.bin
>>> (size 43008)
>>>
>>> * I just tested exactly at LBA 65535 (works all versions) and LBA
>>> 65536 (fails all versions > 5.00).
>>>
>>
>> What the heck... there are just about zero plausible differences
>> between 5.00 and 5.01.
>>
>> I'm wondering if 17a36e2c91706512e6c425222c9a9a451d9db854 could
>> plausibly have anything to do with this, since that seems to be the
>> only possible patch that might affect isolinux.  Is there any way you
>> could try 5.01-pre1 and 5.01-pre2?  If -pre1 works and -pre2 doesn't,
>> it is likely that the problem lies in that commit.
>>

Yes this is the offending commit as I said in the previous message
[#1](*) reverting fixes it.

> 
> If you have the ability to rebuild Syslinux from source, perhaps you
> could try the following patch?

Yes. I done the rebuild, but I can not test just now (enconding video!).
I will post the result in ~10 hours ;)

If anyone that can reproduce the issue want to test, here is the
compressed (~167K) ISO image (~129M)[#2].
This is just and ISO image with isolinux.bin (at LBA 65536) patched +
"coco" (a file filled with \0), so if works propertly, you can see
message about missing ldlinux.c32.


Thanks for your time!


[#1] http://www.syslinux.org/archives/2013-November/021187.html
[#2]
https://dl.dropboxusercontent.com/u/88891866/test-isolinux-6.02.patched.iso.gz

https://dl.dropboxusercontent.com/u/88891866/test-isolinux-6.02.patched.iso.gz.sha1



(*) PS: Why messages sent to syslinux mailing-list takes too longer time
to become available (I am registered)?

-- 
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1

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