UEFI + Legacy BIOS TFTP/PXELINUX

[Rémy Dernat]

Hi,

I am trying to set up an UEFI boot pxe mainly because our hardware servers
do not support full legacy BIOS anymore (particularly hard disk plugin on
those servers).

Our legacy pxelinux works just fine from a while now (and thanks for it).

I followed this link :
https://lists.uni-koeln.de/pipermail/linux-fai/2014-February/010294.html
... with no luck. I created an "UEFI" specific class to avoid the erase of
DEFAULT, and put everything in that new class, because we will need to keep
the pxelinux config.

My tftp fai folder is organised like this:
```
root at faiserv:/srv# tree -L 2
.
├── fai
│   ├── config
│   └── nfsroot
├── nfs4
└── tftp
    └── fai

root at faiserv:/srv/tftp/fai# tree -L 2
.
├── c2960s-universalk9-tar.150-2a.SE9.tar
├── cisco-ios-150-2a.tar -> c2960s-universalk9-tar.150-2a.SE9.tar
├── efi
│   ├── fonts
│   ├── grub.cfg
│   ├── grub.cfg.nok
│   ├── i386-pc
│   ├── locale
│   ├── pxelinux.cfg -> ../pxelinux.cfg
│   ├── unicode.pf2
│   └── x86_64-efi
├── gpxelinux.0
├── initrd.img-3.16.0-4-amd64
├── initrd.img-3.16.0-6-amd64
├── ldlinux.c32
├── lpxelinux.0
├── pxelinux.0
├── pxelinux.0.back
├── pxelinux.cfg
│   ├── 0A01FD03
│   ├── 0A01FFF2
│   ├── A226B5A1.disable
│   ├── A226B5A2.disable
│   ├── A226B5A3.disable
│   ├── A226B5A4.disable
│   ├── A226B5A5.disable
│   ├── A226B5A6.disable
│   ├── A226B5A7.disable
│   ├── A226B5A9
│   ├── A226B5AA.disable
│   ├── A226B5AB.disable
│   ├── A226B5B0.disable
│   ├── A226B5B4.disable
│   ├── A226B5B8
│   └── default
├── syslinux.efi
├── vmlinuz-3.16.0-4-amd64
└── vmlinuz-3.16.0-6-amd64

```

I do not know if the UEFI is also searching for a filename matching its IP
address with the hexa value, so I created a symbolic link to the
pxelinux.cfg parent directory...


I have no problem with DHCP, and my client is loading the grub.cfg menu.
However, it fails while searching for the nfsroot. The error I get (with
debug=all) is (replacing sensitive informations):
```
kern/disk.c:196 : Opening `tftp,IP.IP.IP.IP'...
disk/efi/efidisk.c:461 : opening tftp
kern/disk.c: 281: Opening `tftp,IP.IP.IP.IP' failed.
kern/disk.c: 295: Closing `tftp'.
```


Here is my grub.cfg config :
```
root at faiserv:/srv/tftp/fai/efi# cat grub.cfg
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
set timeout=5
# for debug:
#set pager=1
set debug=all

insmod efi_gop
insmod efi_uga
if loadfont ${prefix}/unicode.pf2
then
    insmod gfxterm
    set gfxmode=auto
    set gfxpayload=keep
    terminal_output gfxterm
fi

menuentry "Install from FAI" {
     linux  vmlinuz-3.16.0-6-amd64 rw ip=dhcp root=/dev/nfs
nfsroot=IP.IP.IP.IP:/srv/fai/nfsroot FAI_FLAGS=verbose,sshd,createvt,reboot
FAI_ACTION=install server=faiserv.acme.ltd
FAI_CONFIG_SRC=nfs://faiserv.acme.ltd/srv/fai/config
     initrd initrd.img-3.16.0-6-amd64
}

```


Any help would be greatly appreciated.

Thanks,
Rémy
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