I am now able to capture the entire output at boot: (thanks to imil@!)
(With QEMU, with and without NVMM, as i386 or x86_64, -machine q35 or pc)
> [ 1.0000000] [ Kernel symbol table invalid! ]
> [ 1.0000000] multiboot: Information structure flags: 0x0000024f
> [ 1.0000000] multiboot: Boot loader: qemu
> [ 1.0000000] multiboot: Command line: obj-i386/sys/arch/i386/compile/GENERIC/netbsd console=com
> [ 1.0000000] multiboot: 639 KB lower memory, 129920 KB upper memory
> [ 1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
> [ 1.0000000] 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013,
> [ 1.0000000] 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023
> [ 1.0000000] The NetBSD Foundation, Inc. All rights reserved.
> [ 1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
> [ 1.0000000] The Regents of the University of California. All rights reserved.
>
> [ 1.0000000] NetBSD 10.99.2 (GENERIC) #0: Tue Jan 31 21:11:24 UTC 2023
> [ 1.0000000] mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/i386/compile/GENERIC
> [ 1.0000000] total memory = 127 MB
> [ 1.0000000] avail memory = 103 MB
> [ 1.0000040] mainbus0 (root)
> [ 1.0000040] ACPI: RSDP 0x00000000000F59C0 000014 (v00 BOCHS )
> [ 1.0000040] ACPI: RSDT 0x0000000007FE18F6 000034 (v01 BOCHS BXPC 00000001 BXPC 00000001)
> [ 1.0000040] ACPI: FACP 0x0000000007FE17AA 000074 (v01 BOCHS BXPC 00000001 BXPC 00000001)
> [ 1.0000040] ACPI: DSDT 0x0000000007FE0040 00176A (v01 BOCHS BXPC 00000001 BXPC 00000001)
> [ 1.0000040] ACPI: FACS 0x0000000007FE0000 000040
> [ 1.0000040] ACPI: APIC 0x0000000007FE181E 000078 (v01 BOCHS BXPC 00000001 BXPC 00000001)
> [ 1.0000040] ACPI: HPET 0x0000000007FE1896 000038 (v01 BOCHS BXPC 00000001 BXPC 00000001)
> [ 1.0000040] ACPI: WAET 0x0000000007FE18CE 000028 (v01 BOCHS BXPC 00000001 BXPC 00000001)
> [ 1.0000040] ACPI: 1 ACPI AML tables successfully acquired and loaded
> [ 1.0000040] ioapic0 at mainbus0 apid 0
> [ 1.0000040] cpu0 at mainbus0 apid 0
> [ 1.0000040] cpu0: Intel 386-class
> [ 1.0000040] cpu0: node 0, package 0, core 0, smt 0
> [ 1.0000040] panic: NetBSD requires an 80486DX or later processor
> [ 1.0000040] cpu0: Begin traceback...
> [ 1.0000040] ?(c1334960,c1735d40,c1735d58,c04acf3b,c1334960,c172ad00,31,0,0,0) at c0dbdcce
> [ 1.0000040] ?(c1334960,c172ad00,31,0,0,0,c1670b40,c1735d98,c04999e6,c1623f80) at c0dbdd97
> [ 1.0000040] ?(c1623f80,1,2,c13f8b91,c1acdcec,c19ec224,c19ec600,c1623f80,c13f8b91,c1acdd34) at c04acf3b
> [ 1.0000040] ?(c19ec200,c19ec600,c1735e28,c19ec200,c1735e24,c1735e28,c19ec200,c19ec600,c1735dec,c19ec200) at c04999e6
> [ 1.0000040] ?(c04c8811,c1735dec,0,c1735e10,c04b24e3,c1679840,c0d9e28a,c12d68da,c1735e24,0) at c0d9f624
> [ 1.0000040] ?(c19ec200,c1735e28,c04c8811,c1735e38,0,0,0,1,c11b119c,1) at c0d9f878
> [ 1.0000040] ?(c80cb84a,c19ec200,c19ec200,0,0,c1735e8c,c04c921b,c04c86c9,c19ec200,0) at c04c8799
> [ 1.0000040] ?(c04c86c9,c19ec200,0,c19ec200,c1735ee0,c0139119,c19ec200,c1735ea4,c141f455,c1ad9c5c) at c046e01c
> [ 1.0000040] ?(c19ec200,c1735ea4,c141f455,c1ad9c5c,0,c1acdd58,c1735ee0,c0d9c7a6,c13f8b91,c1acdd58) at c04c921b
> [ 1.0000040] ?(0,c19ec200,0,0,0,0,0,c19ec200,c1668d08,0) at c0139119
> address 0x0 is invalid
> [ 1.0000040] ?(0,c1735f30,0,1100000,0,0,0,0,0,0) at c0d9f624
> address 0xdc45b0e8 is invalid
> address 0xdc45b0e8 is invalid
> [ 1.0000040] ?(c12d4f09,0,c1735fb0,c0f86ccf,3,1,64,0,0,0) at c0d9fa00
> address 0x0 is invalid
> address 0x0 is invalid
> [ 1.0000040] ?(3,1,64,0,0,0,0,0,54fe000,0) at c0127b7e
> address 0x0 is invalid
> address 0x0 is invalid
> address 0x0 is invalid
> address 0x0 is invalid
> [ 1.0000040] ?(0,0,0,0,0,0,0,0,0,0) at c0f86ccf
> [ 1.0000040] cpu0: End traceback...
> [ 1.0000040] fatal breakpoint trap in supervisor mode
> [ 1.0000040] trap type 1 code 0 eip 0xc0128134 cs 0x8 eflags 0x202 cr2 0 ilevel 0x8 esp 0xc1735d24
> [ 1.0000040] curlwp 0xc165a840 pid 0 lid 0 lowest kstack 0xc17332c0
> Stopped in pid 0.0 (system) at c0128134: popl %ebp
> db{0}>
Note that even after disabling ACPI in userconf:
> [ 1.0000000] uc> disable acpi
> [ 1.0000000] [674] acpi0 disabled
> [ 1.0000000] uc> quit
> [ 1.0000000] Continuing...
> [ 1.0000040] mainbus0 (root)
> [ 1.0000040] mainbus0: Intel MP Specification (Version 1.4) (BOCHSCPU 0.1 )
> [ 1.0000040] cpu0 at mainbus0 apid 0
> [ 1.0000040] ACPI Error: AE_BAD_PARAMETER, Thread 3244664896 could not acquire Mutex [ACPI_MTX_Tables] (0x2) (20221020/utmutex-326)
> [ 1.0000040] cpu0: Intel 386-class
> [ 1.0000040] cpu0: node 0, package 0, core 0, smt 0
> [ 1.0000040] panic: NetBSD requires an 80486DX or later processor
> [ 1.0000040] cpu0: Begin traceback...
> [ 1.0000040] ?(c1334960,c1735d20,c1735d38,c04acf3b,c1334960,c172ad00,31,0,0,0) at c0dbdcce
> [ 1.0000040] ?(c1334960,c172ad00,31,0,0,0,c1670b40,c1735d78,c04999e6,c1623f80) at c0dbdd97
> [ 1.0000040] ?(c1623f80,1,2,c13f8b91,c1acdd10,c19ec224,c19ec400,c1623f80,c13f8b91,c1acdd58) at c04acf3b
> [ 1.0000040] ?(c19ec200,c19ec400,c1735e08,c19ec200,c1735e04,c1735e08,c19ec200,c19ec400,c1735dcc,c19ec200) at c04999e6
> [ 1.0000040] ?(c04c69a2,c1735dcc,0,8,c1ad8680,38c,c0d9e28a,c12d68da,c1735e04,0) at c0d9f624
> [ 1.0000040] ?(c19ec200,c1735e08,c04c69a2,c1735e18,0,0,0,1,c11b119c,1) at c0d9f878
> [ 1.0000040] ?(384,1,c80cabc0,d0,f5bb0,c1735e8c,c1735ea4,0,c80cac80,c19ec200) at c04c73f1
> [ 1.0000040] ?(c19ec200,c1735ea4,c141f455,c1ad9c5c,0,c1acdd58,c1735ee0,c0d9c7a6,c13f8b91,c1acdd58) at c04c7f85
> [ 1.0000040] ?(0,c19ec200,0,0,0,0,0,c19ec200,c1668d08,0) at c01391a6
> address 0x0 is invalid
> [ 1.0000040] ?(0,c1735f30,0,1100000,0,0,0,0,0,0) at c0d9f624
> address 0xdc45b0e8 is invalid
> address 0xdc45b0e8 is invalid
> [ 1.0000040] ?(c12d4f09,0,c1735fb0,c0f86ccf,3,1,64,0,0,0) at c0d9fa00
> address 0x0 is invalid
> address 0x0 is invalid
> [ 1.0000040] ?(3,1,64,0,0,0,0,0,54fe000,0) at c0127b7e
> address 0x0 is invalid
> address 0x0 is invalid
> address 0x0 is invalid
> address 0x0 is invalid
> [ 1.0000040] ?(0,0,0,0,0,0,0,0,0,0) at c0f86ccf
> [ 1.0000040] cpu0: End traceback...
> [ 1.0000040] fatal breakpoint trap in supervisor mode
> [ 1.0000040] trap type 1 code 0 eip 0xc0128134 cs 0x8 eflags 0x202 cr2 0 ilevel 0x8 esp 0xc1735d04
> [ 1.0000040] curlwp 0xc165a840 pid 0 lid 0 lowest kstack 0xc17332c0
> Stopped in pid 0.0 (system) at c0128134: popl %ebp
> db{0}>
HTH,
--
khorben
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