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kern/52713: NetBSD-8.0_BETA EFI CD-BOOT fails on Dell R740 and others

>Number:         52713
>Category:       kern
>Synopsis:       NetBSD-8.0_BETA EFI CD-BOOT fails on Dell R740 and others
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 10 10:40:00 +0000 2017
>Originator:     Frank Kardel
>Release:        NetBSD 8.0_BETA-2017-11-10
	Install ISO image
Architecture: x86_64
Machine: amd64
	When booting above image on a Dell R740 or a Supermicro A2SDi the bootloader fails with:

	>> NetBSD/x86 EFI Boot (x64), Revision 1.0 (from NetBSD 8.0_BETA)
	>> Memory: 640/1481672 k
	Press return to boot now, any other key for boot menu
	booting hd0a:netbsd - starting in 0 seconds.
	open netbsd: bad partition
	boot: hd0a:netbsd: bad partition
	booting hd0a:netbsd.gz (howto 0x20000)
	open netbsd.gz: bad partition
	boot: hd0a:netbsd.gz: bad partition
	booting hd0a:onetbsd - starting in 0 seconds.
	open onetbsd: bad partition
	boot: hd0a:onetbsd: bad partition
	booting hd0a:onetbsd.gz (howto 0x20000)
	open onetbsd.gz: bad partition
	boot: hd0a:onetbsd.gz: bad partition
	booting hd0a:netbsd.old - starting in 0 seconds.
	open netbsd.old: bad partition
	boot: hd0a:netbsd.old: bad partition
	booting hd0a:netbsd.old.gz (howto 0x20000)
	open netbsd.old.gz: bad partition
	boot: hd0a:netbsd.old.gz: bad partition

	Boot above image and watch the bootloader fail.
	Analysis has shown that the EFI environment claims the device to
	be a hard disk. Thus only the hard disk label reading strategies
	are tried and a check for ISO9660 is no done. 
	Bootloader need to grow better label/partition reding strategies.
	No fix known right now save for installing an alternate OS.
	This happens now on two EFI-only systems and EFI-only is appearing
	more often now.


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