[syslinux] syslinux.efi and vendor-class-identifier

James Pearson james-p at moving-picture.com
Tue Oct 8 08:11:22 PDT 2019

Gene Cumm wrote:
> On Mon, Oct 7, 2019 at 12:05 PM James Pearson via Syslinux
> <syslinux at syslinux.org> wrote:
>>    Getting cached packet
>>    My IP is
>>    core_udp_sendto: stalling on configure with no mapping
>>    core_udp_sendto: aborting on no mapping
>>    disable UseDefaultAddress
>>    core_udp_sendto: udp->Configure() unsuccessful (20)
> So the 3rd/4th line would have been printed within ~1 second after the
> "My IP is" statement.  At least we have a value for the error
> "EFI_ALREADY_STARTED".  I'f I'm reading the protocol book right, we
> already have an open handle and it's refusing as a result.  I'd guess
> when we attempt to use "UseDefaultAddress", it triggers the DHCP
> Discover.

The errors appear ~75 seconds after the 'My IP is ...' line is printed

> As a side note, some installers support booting in BIOS mode with the
> CSM then installing to disk for UEFI boot.  I've also seen firmware
> config options like "Allow legacy OROMs" that may help for BIOS boot.

I can't find any option to boot in BIOS mode and install an EFI boot set 
up on disk with the RHEL/CentOS 7 installer


James Pearson

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