grub pxe not working in qemu

[Pali]

I installed grub into /var/lib/tftpboot/ (which is root of tftpd-hpa)
$ sudo grub-mknetdir --net-directory=/var/lib/tftpboot/

Then I created tap0 interface:
$ sudo tunctl -t tap0 -u pali

I trying to boot grub via pxe, but only rescue grub mode is started. I show error "error: no such disk."
$ qemu-system-x86_64 -curses -net tap,ifname=tap0,script=/bin/true,downscript=/bin/true -net nic

iPXE (http://ipxe.org) 00:03.0 C900 PCI2.10 PnP PMM+17FC92A0+17F892A0 C900

Booting from DVD/CD...
Boot failed: Could not read from CDROM (code 0003)
Booting from ROM...
iPXE (PCI 00:03.0) starting execution...ok
iPXE initialising devices...ok

iPXE 1.0.0+ -- Open Source Network Boot Firmware -- http://ipxe.org
Features: HTTP iSCSI DNS TFTP AoE bzImage COMBOOT ELF MBOOT PXE PXEXT

net0: 52:54:00:12:34:56 using rtl8139 on PCI00:03.0 (open)
 [Link:up, TX:0 TXE:0 RX:0 RXE:0]
DHCP (net0 52:54:00:12:34:56)...... ok
net0: 10.0.0.10/255.255.255.0 gw 10.0.0.1
Next server: 10.0.0.1
Filename: /boot/grub/i386-pc/core.0
tftp://10.0.0.1//boot/grub/i386-pc/core.0... ok
error: no such disk.
grub rescue>

I have 64bit Ubuntu Precise and DHCP and TFTP server are correctly running on tap0 interface.

Look like this is same problem as reported in Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=635877

[Daniel Letzeisen (dtl131)]

Adding bug watch: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=635877

[Pali (pali)]

In that debian bug is written that problem was fixed in upstream. Can be patch from upstrem backported to ubuntu?

[Pali (pali)]

So what it state of this bug? When will be patch in ubuntu?

[Pali (pali)]

Still not fixed in precise.

[Pali (pali)]

BUMP!

[Colin Watson (cjwatson)]

It's fixed in Ubuntu 12.10 and newer, but perhaps we should backport this patch for 12.04.5.

[Pali (pali)]

So, when it will be fixed?

[Steve Langasek (vorlon)]

The Precise Pangolin has reached end of life, so this bug will not be fixed for that release