>>> On 07.06.17 at 14:46, <paul.durr...@citrix.com> wrote: >> -----Original Message----- >> From: Jan Beulich [mailto:jbeul...@suse.com] >> Sent: 07 June 2017 13:00 >> To: Paul Durrant <paul.durr...@citrix.com> >> Cc: Julien Grall (julien.gr...@arm.com) <julien.gr...@arm.com>; Andrew >> Cooper <andrew.coop...@citrix.com>; xen-devel(xen- >> de...@lists.xenproject.org) <xen-de...@lists.xenproject.org>; >> 'BorisOstrovsky' <boris.ostrov...@oracle.com>; Juergen Gross >> <jgr...@suse.com> >> Subject: RE: [Xen-devel] debian stretch dom0 + xen 4.9 fails to boot >> >> >>> On 07.06.17 at 13:55, <paul.durr...@citrix.com> wrote: >> >> From: Jan Beulich [mailto:jbeul...@suse.com] >> >> Sent: 07 June 2017 12:50 >> >> 2) Provide the E820 map of that box. >> >> I'm suspecting the BIOS might use an EBDA without recording it in >> >> the low BIOS data area. If it's reported in E820 that would then >> >> likely be the final kick for us to obey to the E820 map when >> >> determining where to put the trampoline. >> >> >> > >> > The stretch kernel booted bare-metal reports: >> > >> > [ 0.000000] e820: BIOS-provided physical RAM map: >> > [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x00000000000963ff] >> usable >> > [ 0.000000] BIOS-e820: [mem 0x0000000000096400-0x000000000009ffff] >> reserved >> >> There we go. Subtracting 4k may then even be too little (depending >> what EBDA and low memory values the system reports). Of course >> it would be a BIOS bug if they reported some memory they use for >> themselves through only E820, as that interface is not required to >> be present, and really, really old software wouldn't even know >> about it and would hence also be in trouble. >> > > Neither 4k nor 8k seemed to be enough. Even subtracting another > 64k doesn't work.
That's rather unexpected. > I guess I'm going to have to try to write some code to log values to > the VGA buffer to see what is going on. Good luck! Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
