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install/39510: NetBSD/amd64 won't install on MacBook (GPT)

>Number:         39510
>Category:       install
>Synopsis:       NetBSD/amd64 won't install on MacBook (GPT)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 10 11:00:00 +0000 2008
>Originator:     Jonathan Perkin
>Release:        4.99.72 (20080818 snapshot)
(c+p by hand)

wd0 at atabus2 drive 1: <FUJITSU MHW2160BHPL>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 149GB, 310101 cyl, 16 head, 63 sec, 512 bytes/sect x 312581808 sectors
wd0: GPT GUID: 000071e0-0e0a-0000-6465-00007b710000
dk0 at wd0: EFI system partition
dk0: 409600 blocks at 40, type: msdos
wd0: skipping entry 1 (7e9db2c5-cbf0-4c3a-8067-14861e04bb33), type 
wd0: skipping entry 2 (e0175749-2bb3-470b-a1c4-f19aa62bbd2c), type 
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd0(piixide1:0:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

During install, NetBSD picks up the partition table ok:

    Start( MB)  Size( MB) Flg Kind
    ---------- --------- --- ----
 a:          0        200     Unknown (238)
 b:        200     146304     Unknown (175)
 c:     146504       6123     NetBSD

but when trying to newfs, fails with

  Setting up DOS partition table
  newfs: /dev/rwd0a: open for read: Device busy

According to

disabling GPT support fixes this, although I've not yet verified this myself.

Install NetBSD/amd64 snapshot on a MacBook, possibly other machines with 
Disable GPT support.

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