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EC2: Default to UEFI booting

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This reduces the FreeBSD boot time by approximately 5 seconds,
roughly equally divided betwenn two factors:
* Disk I/O is faster in the EFI loader since it can perform larger
I/Os.  (The BIOS loader is limited due to the use of bounce buffers
in sub-1M memory.)
* The EFI console is much faster than the VGA console.

Note however that not all EC2 instance types support UEFI; as a
general rule the newer instances (based on Amazon's "Nitro" platform)
support UEFI but the older instances (based on Xen) do not.

X-MFC:	TBD based on tradeoff between performance and compatibility
Relnotes:	yes
Sponsored by:	https://www.patreon.com/cperciva
This commit is contained in:
Colin Percival 2021-09-16 09:22:42 -07:00
parent 0aa2a94ea6
commit b43d7aa09b
1 changed files with 0 additions and 4 deletions
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4
release/Makefile.ec2
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@ -25,12 +25,8 @@ SSMOPTS= --ssm-name ${SSMPREFIX}/${TARGET_ARCH:S/aarch64/arm64/}/base/ufs/${REVI
EC2ARCH= --${TARGET_ARCH:S/aarch64/arm64/}
.endif
.if !defined(AMIBOOTMETHOD)
.if ${TARGET_ARCH} == "amd64"
AMIBOOTMETHOD= BIOS
.else
AMIBOOTMETHOD= UEFI
.endif
.endif
.if ${AMIBOOTMETHOD} == "UEFI" && ${TARGET_ARCH} == "amd64"
BOOTMODEOPT= --uefi
.endif