Xen NFS boot

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

	Hello,

	I'm trying to install Xen (4.13) on a diskless NetBSD station (with of
course 9.1 kernel). This workstation ran fine NetBSD 9.1 before.

	If I understand log on console, xen kernel is loaded (with external
nfs.kmod support), dom0 also, but after ethernet adapter restart, I only
obtain a black screen. Ethernet adapter seems to be reinitialized by
dom0. dom0, of course, is built with :

options     NFS_BOOT_DHCP,NFS_BOOT_BOOTPARAM

	I have tried to debug without any success. tcpdump on server shows :

legendre# tcpdump -i agr0  host schwarz | grep tftp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on agr0, link-type EN10MB (Ethernet), capture size 262144 bytes
11:05:59.631211 IP schwarz.systella.fr.ah-esp-encap >
legendre.systella.fr.tftp:  40 RRQ "netbsd/pxeboot_ia32.bin" octet tsize 0
11:05:59.671268 IP schwarz.systella.fr.acp-port >
legendre.systella.fr.tftp:  45 RRQ "netbsd/pxeboot_ia32.bin" octet
blksize 1456
11:05:59.815024 IP schwarz.systella.fr.nati-dstp >
legendre.systella.fr.tftp:  32 RRQ "netbsd/boot-schwarz.cfg" octet
11:06:05.332492 IP schwarz.systella.fr.cifs > legendre.systella.fr.tftp:
 30 RRQ "netbsd/xen-schwarz.gz" octet
11:06:05.407272 IP schwarz.systella.fr.cifs > legendre.systella.fr.tftp:
 30 RRQ "netbsd/xen-schwarz.gz" octet
11:06:05.929331 IP schwarz.systella.fr.agriserver >
legendre.systella.fr.tftp:  30 RRQ "netbsd/xen-schwarz.gz" octet
11:06:06.449334 IP schwarz.systella.fr.agriserver >
legendre.systella.fr.tftp:  30 RRQ "netbsd/xen-schwarz.gz" octet
11:06:07.018520 IP schwarz.systella.fr.csregagent >
legendre.systella.fr.tftp:  35 RRQ "netbsd/netbsd-dom0-schwarz" octet
11:06:07.094577 IP schwarz.systella.fr.csregagent >
legendre.systella.fr.tftp:  35 RRQ "netbsd/netbsd-dom0-schwarz" octet
11:06:13.362336 IP schwarz.systella.fr.emce > legendre.systella.fr.tftp:
 36 RRQ "netbsd/nfs-xen-schwarz.kmod" octet
11:06:13.372802 IP schwarz.systella.fr.emce > legendre.systella.fr.tftp:
 36 RRQ "netbsd/nfs-xen-schwarz.kmod" octet
11:06:13.609406 IP schwarz.systella.fr.emce > legendre.systella.fr.tftp:
 35 RRQ "netbsd/netbsd-dom0-schwarz" octet
11:06:19.816112 IP schwarz.systella.fr.servserv >
legendre.systella.fr.tftp:  36 RRQ "netbsd/nfs-xen-schwarz.kmod" octet

	I don't understand why the last line contains a call to
netbsd/nfs-xen-schwarz.kmod. This module is loaded to be linked with XEN
kernel, not to be linked with dom0.

	My dgcpd.conf contains :

    host schwarz {
#       hardware ethernet    38:2C:4A:70:14:D1;
        hardware ethernet    38:2C:4A:6D:CF:CB;
        fixed-address        192.168.10.106;
        if substring (option vendor-class-identifier, 0, 20)
                = "PXEClient:Arch:00000" {
            filename     "netbsd/pxeboot_ia32.bin";
        } else if filename = "boot.cfg" {
                filename = "tftp:netbsd/boot-schwarz.cfg";
        } else if filename = "netbsd" {
                filename "tftp:netbsd/netbsd-schwarz";
        } else if filename = "netbsd-dom0" {
                filename "tftp:netbsd/netbsd-dom0-schwarz";
        } else if filename = "//nfs/nfs.kmod" {
                filename "tftp:netbsd/nfs-xen-schwarz.kmod";
        } else if filename = "xen.gz" {
                filename "tftp:netbsd/xen-schwarz.gz";
        }
        next-server          192.168.10.128;
        option swap-server   192.168.10.128;
        option root-path     "/srv/schwarz";
    }

	My boot.vfg contains :

menu=Boot normally:rndseed /var/db/entropy-file;boot netbsd
menu=Boot single user:rndseed /var/db/entropy-file;boot netbsd -s
menu=Disable ACPI:rndseed /var/db/entropy-file;boot netbsd -2
menu=Disable ACPI and SMP:rndseed /var/db/entropy-file;boot netbsd -12
menu=Drop to boot prompt:prompt
menu=Xen:load netbsd-dom0;multiboot xen.gz dom0_mem=512M
dom0_max_vcpus=1 dom0_vcpus_pin
default=6
timeout=5
clear=1

	I suppose I have done a mistake. Help will be welcome.

	Best regards,

	JKB