Date: Sat, 7 Feb 2015 03:49:41 -0800 From: Mark Millard <markmi@dsl-only.net> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: HEADS UP: powerpc64 kernel format change [booted a PowerMac G5 quad-core][those problems booting some kernel variants: new info] Message-ID: <335C8DCD-33DF-4430-A0FA-77669C513C61@dsl-only.net>
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Nathan, you had the below written about my problems with booting my = builds of, say, 10.1-STABLE (kernel=3D"kernel10.1S" in = /boot/loaderl.conf) without involving the kernel from my build of = 10.1-RELEASE-p5 (kernel=3D"kernel10.1RE" or sometimes kernel=3D"kernel" = in /boot/loader.conf), where kernel=3D"kernel10.1RE" in = /boot/loader.conf boots just fine... > So this has to be some kind of icache issue. If you unload and reload=20= > the *same* kernel, does it also help? > -Nathan (Part of the evidence was: Using kernel=3D"kernel10.1RE" in = /boot/loader.conf, stopping at the 10sec prompt, unloading, and doing = "boot kernel 10.1S" lets my 10.1-STABLE builds boot that will not boot = directly.) Well I've got a little more information from a different direction: A = way to create the problem when building my 10.1-RELEASE-p5 kernel is to = enable VERBOSE_SYSINIT. More specifically the comparison/contrast I've = done so far is... I added the following 3 lines to my GENERIC64vtsc for my 10.1-RELEASE-p5 = source tree (no other changes elsewhere at all) options VERBOSE_SYSINIT options BOOTVERBOSE=3D1 options BOOTHOWTO=3DRB_VERBOSE and rebuilt kernel the via KERNCONF=3DGENERIC64vtsc INSTKERNNAME=3Dkernel = the resulting kernel load fails if referenced by /boot/loader.conf via = kernel=3D"kernel" line. The %SRR0 address value listed is the same as = for kernel10.1S: 1c277fc. But booting using kernel=3D"kernel10.1RE" in = /boot/loader.conf, stopping at the 10sec wait, unloading, and typing = "boot kernel" boots fine --just like "boot kernel10.1S". Note: GENERIC64vtsc has option DDB enabled (and GBD too). (This is = associated my with my information gathering for early G5 boot = crashes/hangups.) Note: This is the first time I've ever tried any of those 3 options. My = kernel10.1S build was not based on them. Then I changed the 3 lines by just commenting out the first of the 3 = that I had added #options VERBOSE_SYSINIT options BOOTVERBOSE=3D1 options BOOTHOWTO=3DRB_VERBOSE and rebuilt via KERNCONF=3DGENERIC64vtsc INSTKERNNAME=3Dkernel again. = The resulting /boot/kernel/... boots just fine when kernel=3D"kernel" is = used in /boot/loader.conf : no need for using kernel10.1RE or for = stopping to do anything special. =3D=3D=3D Mark Millard markmi at dsl-only.net
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