I thought this device tree will help any one who might want to work on the Mac99 target. It is the device tree from a G3 iBook.
0 > dev / ok 0 > ls ff83d628: /cpus ff83d8d8: /PowerPC,750@0 ff83dcb8: /l2-cache ff83e938: /chosen ff83eb50: /memory@0 ff83edf0: /openprom ff83ef98: /client-services ff840288: /rom@ff800000 ff840488: /boot-rom@fff00000 ff8406c0: /macos ff8407c8: /options ff8408d0: /aliases ff8413b8: /packages ff841498: /deblocker ff841e30: /disk-label ff8428f8: /obp-tftp ff84c1d8: /telnet ff84cad8: /mac-parts ff84e280: /mac-files ff851138: /hfs-plus-files ff855f58: /fat-files ff857d50: /iso-9660-files ff858bb0: /bootinfo-loader ff85a888: /xcoff-loader ff85b320: /pe-loader ff85bd70: /elf-loader ff85d418: /usb-hid-class ff85ff58: /usb-ms-class ff862ba8: /usb-audio-class ff8d0720: /sbp2-disk ff8d30c0: /ata-disk ff8d4e28: /atapi-disk ff8d6d70: /bootpath-search ff8dd700: /terminal-emulator ff8dd810: /firewire-disk-mode ff8f20c8: /pseudo-hid ff8f21c8: /keyboard ff8f28c0: /mouse ff8f2e58: /eject-key ff8f3328: /pseudo-sound ff8f3658: /multiboot ff906648: /diagnostics ff906728: /nvram@fff04000 ff907328: /uni-n@f8000000 ff9075f0: /i2c@f8001000 ff907eb8: /cereal ff9085e8: /pci@f0000000 ff93b1f0: /uni-north-agp@b ff93b4d8: /ATY,RageM_Lp@10 ff909758: /pci@f2000000 ff90ba40: /mac-io@17 ff90f9f8: /interrupt-controller@40000 ff90fc48: /gpio@50 ff90fdb0: /extint-gpio1 ff90ffd0: /programmer-switch ff910188: /extint-gpio12 ff910360: /i2s@10000 ff910590: /i2s-a@10000 ff9108c0: /sound ff910f70: /i2s-b@11000 ff911148: /escc-legacy@12000 ff9113b8: /ch-a@12004 ff9115b8: /ch-b@12000 ff9117b8: /escc@13000 ff911a40: /ch-a@13020 ff912468: /ch-b@13000 ff912de8: /timer@15000 ff912ff8: /via-pmu@16000 ff9165d0: /rtc ff916d20: /adb ff916ed8: /keyboard@2 ff917c80: /mouse@3 ff918068: /power-mgt ff953fb8: /usb-power-mgt ff918380: /battery@0 ff9184a8: /backlight@f300 ff918648: /i2c@18000 ff918f50: /cereal ff953c68: /i2c-modem ff919698: /ata-4@1f000 ff91bd88: /disk ff91c4e8: /ata-3@20000 ff91ebd8: /disk ff91f338: /ata-3@21000 ff921a28: /disk ff928400: /usb@18 ff90a8c8: /pci@f4000000 ff936828: /ethernet@f ff954178: /ethernet-phy