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="kernel10.1S" in /boot/loaderl.conf) without involving the kernel from my build of 10.1-RELEASE-p5 (kernel="kernel10.1RE" or sometimes kernel="kernel" in /boot/loader.conf), where kernel="kernel10.1RE" in /boot/loader.conf boots just fine... > So this has to be some kind of icache issue. If you unload and reload > the *same* kernel, does it also help? > -Nathan (Part of the evidence was: Using kernel="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=1 options BOOTHOWTO=RB_VERBOSE and rebuilt kernel the via KERNCONF=GENERIC64vtsc INSTKERNNAME=kernel the resulting kernel load fails if referenced by /boot/loader.conf via kernel="kernel" line. The %SRR0 address value listed is the same as for kernel10.1S: 1c277fc. But booting using kernel="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=1 options BOOTHOWTO=RB_VERBOSE and rebuilt via KERNCONF=GENERIC64vtsc INSTKERNNAME=kernel again. The resulting /boot/kernel/... boots just fine when kernel="kernel" is used in /boot/loader.conf : no need for using kernel10.1RE or for stopping to do anything special. === Mark Millard markmi at dsl-only.nethome | help
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