Gerardo Exequiel Pozzi
2013-Nov-26 05:22 UTC
[syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e. pre-UEFI) systems
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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 555 bytes Desc: OpenPGP digital signature URL: <http://www.zytor.com/pipermail/syslinux/attachments/20131126/2d052063/attachment.sig>
Gerardo Exequiel Pozzi
2013-Nov-26 14:52 UTC
[syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e. pre-UEFI) systems
On 11/26/2013 02:22 AM, Gerardo Exequiel Pozzi wrote:> 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 ;)Yes! Fixed :) I tested at LBA 65536 (~128M) and 655360 (~1280M) and works fine in both cases. The big mistery is why this works in some machines and why fails in others. (maybe garbage in high word of "edx"?) Thanks.> > 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)? > > > > _______________________________________________ > Syslinux mailing list > Submissions to Syslinux at zytor.com > Unsubscribe or set options at: > http://www.zytor.com/mailman/listinfo/syslinux > Please do not send private replies to mailing list traffic. >-- Gerardo Exequiel Pozzi \cos^2\alpha + \sin^2\alpha = 1 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 555 bytes Desc: OpenPGP digital signature URL: <http://www.zytor.com/pipermail/syslinux/attachments/20131126/22eaaa89/attachment.sig>
Thomas Schmitt
2013-Nov-26 16:14 UTC
[syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e. pre-UEFI) systems
Hi, hpa wrote:> - mov dx,cx > + movzx edx,cxGerardo Exequiel Pozzi:> Yes! Fixed :) > (maybe garbage in high word of "edx"?)I am now pondering too, why my machine booted from high LBAs. I understand that the new code zeros the upper 16 bit of EDX. Was there remaining garbage from early BIOS activity before isolinux.bin got started ? Does my BIOS perhaps clean registers before handing over control ? Have a nice day :) Thomas
H. Peter Anvin
2013-Nov-26 17:08 UTC
[syslinux] Sysinux 6 will not boot ISOs on BIOS (i.e. pre-UEFI) systems
On 11/26/2013 06:52 AM, Gerardo Exequiel Pozzi wrote:>> >> Yes. I done the rebuild, but I can not test just now (enconding >> video!). I will post the result in ~10 hours ;) > > Yes! Fixed :) > > I tested at LBA 65536 (~128M) and 655360 (~1280M) and works fine in > both cases. > > The big mistery is why this works in some machines and why fails > in others. (maybe garbage in high word of "edx"?) >Awesome, *thank you* for testing! -hpa
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