My environment settings:

] printenv
baudrate=9600
preboot=menu
ide_doreset=on
ide_cd_timeout=30
menucmd=menu
autoboot=on
override_GlobalInformation=*
override_GlobalControl=*
override_NVRAMControl=*
override_AGPPCIBUS1Access=*
override_HostBusAccessControl=*
override_HostInterfacePLS=*
override_HostReadBufferControl=*
override_XDBusControl=*
override_PCI0_Command=*
override_PCI0_Status=*
override_PCI0_GARTAddress=*
override_PCI0_AGPCommand=*
override_PCI0_LBSideband=*
override_PCI0_Outbound=*
ethaddr=(yours will differ)
ipaddr=192.168.0.1
serverip=192.168.0.2
menu_netboot=tftpboot
pci_irqa=9
pci_irqa_select=edge
pci_irqb=10
pci_irqb_select=edge
pci_irqc=11
pci_irqc_select=edge
pci_irqd=7
pci_irqd_select=edge
agp_enable=on
agp_sideband=off
agp_speed=2x
bootdelay=5
bootcmd=diskboot
autostart=yes
bootdevice=0:1
boot1=cdrom
boot2=ide
boot3=net
menuboot_delay=5
bootargs=root=/dev/hda3 video=radeon:1024x768-8@70 ide=nodma hdc=ide-scsi l2cr=0x80000000
limit_memory=640
stdin=serial
stdout=serial
serial1_address=3f8
serial2_address=2f8
parallel_mode=0
parallel_address=378
usb0_enable=on
usb1_enable=off
ide_maxbus=2

Environment size: 1072/32764 bytes
]