Jtdcftul

$ lsb_release -rd

Description: Ubuntu 14.04.1 LTS

Release: 14.04



dpkg -l grub-efi-amd64-signed

Desired=Unknown/Install/Remove/Purge/Hold

| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend

|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)

||/ Name Version Architecture Description

+++-======================-================-================-=================================================

iU grub-efi-amd64-signed 1.34+2.02~beta2- amd64 GRand Unified Bootloader, version 2 (EFI-AMD64 ve

Grub requests for files to tftpserver are not prefixed with tftproot. Though 'prefix' variable is set. This is being observed in UEFI boot mode. This leads to boot failure as grub is unable to fetch grub.cfg

Relevant O/p from grub prompt:

prefix=(tftp,10.10.1.13)/grub

root=tftp,10.10.1.13

pxe_default_server=10.10.1.13

net_default_ip=10.10.1.161

net_default_mac=a0:d3:c1:fb:86:94

net_default_server:10.10.1.13

grub_cpu=x86_64

grub_platform=efi

tcpdump o/p

1382 17:33:56.955465 IP 10.10.1.161.25300 > 10.10.1.13.tftp: 58 RRQ "/grub/x86_64-efi/command.lst" octet blksiz e 1024 tsize 0

1383 17:33:56.956640 IP 10.10.1.13.45600 > 10.10.1.161.25300: UDP, length 24

1384 17:33:56.956885 IP 10.10.1.161.25301 > 10.10.1.13.tftp: 53 RRQ "/grub/x86_64-efi/fs.lst" octet blksize 102 4 tsize 0

1385 17:33:56.958146 IP 10.10.1.13.42098 > 10.10.1.161.25301: UDP, length 24

1386 17:33:56.958368 IP 10.10.1.161.25302 > 10.10.1.13.tftp: 57 RRQ "/grub/x86_64-efi/crypto.lst" octet blksize 1024 tsize 0

1387 17:33:56.959412 IP 10.10.1.13.33848 > 10.10.1.161.25302: UDP, length 24

1388 17:33:56.959646 IP 10.10.1.161.25303 > 10.10.1.13.tftp: 59 RRQ "/grub/x86_64-efi/terminal.lst" octet blksi ze 1024 tsize 0

1389 17:33:56.961969 IP 10.10.1.13.47148 > 10.10.1.161.25303: UDP, length 24

1390 17:33:56.962482 IP 10.10.1.161.25304 > 10.10.1.13.tftp: 44 RRQ "/grub/grub.cfg" octet blksize 1024 tsize 0

1391 17:33:56.966059 IP 10.10.1.13.38281 > 10.10.1.161.25304: UDP, length 24

Am I missing anything here?

You may need to move the root of the tftp server to /grub to match the prefix assigned by the signed bootloader.

/etc/default/tftpd-hpa:

OPTIONS="-v -s /grub"

TFTP_DIRECTORY="/grub"

Can you see the grub.cfg file from grub?

grub> cat (tftp,10.10.1.13)/grub/grub.cfg

or

grub> cat (tftp,10.10.1.13)/grub.cfg

I also found it helpful for debugging the file to do the following:

grub> configfile (tftp,10.10.1.13)/grub/grub.cfg

error: can't find command 'kernel'

error: can't find command 'append'

...

You can use this to check the syntax for your file.