Failure to install RHEL from AIX server over tftp

Issue

While trying to install RHEL 5.6 from an AIX NIM server to LPARs on the same machine, boot of the installation image fails as follows:

0 > devalias net /vdevice/l-lan@30000063  ok
0 > boot net:192.168.1.99,,192.168.1.2, install

TFTP BOOT ---------------------------------------------------
Server IP.....................192.168.1.99
Client IP.....................192.168.1.2
Subnet Mask...................255.255.255.0
( 1  ) Filename................./tftpboot/ppc64.img
TFTP Retries..................5
Block Size....................512
FINAL FILE SIZE = 12566528  BYTES
CLAIM failed
Call History
------------
throw  - c3b044
$call-method  - c48c98
(poplocals)  - c3c9e8
(init-program)  - c856b8
boot  - c863fc
evaluate  - c4c66c
^c19100   - c19100
invalid pointer - 2b
invalid pointer - 2b
quit  - c4cd4c
quit  - c4cb40

My Fix Pt Regs:
00 0000000000000000 0000000000000000 00000000deadbeef 0000000000c48c94
04 0000000000c420e0 000000000000002b 0000000000c13f60 0000000000c05010
08 0000000010000000 0000000000000000 0000000000000020 0000000000000000
0c 0000000000000000 0000000000c19100 0000000000c1a000 0000000001cc99d8
10 0000000000eb8c3b 0000000000eb88b0 0000000000c48c90 0000000000c48c98
14 fffffffffffffffe 0000000000004000 0000000000000000 0000000000000000
18 0000000000c15000 0000000000c3a000 0000000000c16fc0 0000000000c18fc0
1c 0000000000c22000 0000000000c420e8 0000000000c13fa8 0000000000c12ff8
Special Regs:
    %IV: 00000900     %CR: 82808002    %XER: 20000008  %DSISR: 00000000
  %SRR0: 0000000000c57b78   %SRR1: 800000000000b002
    %LR: 0000000000c6f3f8    %CTR: 0000000000c6f400
   %DAR: 0000000000000000
ok
0 >