NetBSD evbmips64el port installation doesn't work with qemu-system-mips64el.

I successfully installed the NetBSD evbmips64el port on gxemul but was unable to install it on qemu. Trying to boot it on qemu takes me to the 'db>' prompt. Here's the output and backtrace:

panic: pcib_isa_intr_string: bogus isa irq 0x0
kernel: breakpoint trap
Stopped in pid 0.1 (system) at  netbsd:cpu_Debugger+0x4:        jr      ra
                bdslot: nop
db> bt
0xffffffff805977f0: cpu_Debugger+4 (63061,90000000180003f8,6,ffffffff804c2290) ra ffffffff8030acd0 sz 0
0xffffffff805977f0: vpanic+158 (63061,90000000180003f8,6,ffffffff804c2290) ra ffffffff8030ad7c sz 64
0xffffffff80597830: panic+34 (63061,ffffffff803d65b0,0,40) ra ffffffff80109784 sz 96
0xffffffff80597890: pcib_isa_intr_string+6c (63061,ffffffff803d65b0,0,40) ra ffffffff80149bfc sz 16
0xffffffff805978a0: uhci_pci_attach+16c (63061,ffffffff803d65b0,0,40) ra ffffffff802f0400 sz 176
0xffffffff80597950: config_attach_loc+1c8 (63061,ffffffff803d65b0,0,40) ra ffffffff802f053c sz 64
0xffffffff80597990: config_found_sm_loc+5c (63061,ffffffff803d65b0,0,40) ra ffffffff80121354 sz 64
0xffffffff805979d0: pci_probe_device+524 (63061,ffffffff803d65b0,0,0) ra ffffffff80121548 sz 288
0xffffffff80597af0: pci_enumerate_bus+1d0 (63061,ffffffff803d65b0,0,0) ra ffffffff8012167c sz 160
0xffffffff80597b90: pcirescan+5c (63061,ffffffff803d65b0,0,0) ra ffffffff801218c4 sz 32
0xffffffff80597bb0: pciattach+19c (63061,ffffffff803d65b0,0,0) ra ffffffff802f0400 sz 80
0xffffffff80597c00: config_attach_loc+1c8 (63061,ffffffff803d65b0,0,0) ra ffffffff802f053c sz 64
0xffffffff80597c40: config_found_sm_loc+5c (63061,ffffffff803d65b0,0,0) ra ffffffff80108934 sz 64
0xffffffff80597c80: gt_attach+7c (63061,ffffffff803d65b0,0,0) ra ffffffff802f0400 sz 112   
0xffffffff80597cf0: config_attach_loc+1c8 (63061,ffffffff803d65b0,0,0) ra ffffffff802f053c sz 64
0xffffffff80597d30: config_found_sm_loc+5c (63061,ffffffff803d65b0,0,0) ra ffffffff801086ac sz 64
0xffffffff80597d70: mainbus_attach+dc (63061,ffffffff803d65b0,0,0) ra ffffffff802f0400 sz 96
0xffffffff80597dd0: config_attach_loc+1c8 (63061,ffffffff803d65b0,0,0) ra ffffffff80104bf8 sz 64
0xffffffff80597e10: cpu_configure+28 (63061,ffffffff803d65b0,0,0) ra ffffffff803d5f30 sz 16
0xffffffff80597e20: main+3a0 (63061,ffffffff803d65b0,0,0) ra ffffffff801000dc sz 128       
0xffffffff80597ea0: kernel_text+dc (63061,ffffffff803d65b0,0,0) ra 0 sz 0
User-level: pid 0.1

Here's the command that I used:

Build evbmips64el from source and then launch it from qemu (replace the paths relative to your system):

qemu-system-mips64el -cdrom /extra/evbmips64/distrib/evbmips/cdroms/installcd/NetBSD-7.99.71-evbmips-mips64el.iso -hda /extra/evbmips64.img -kernel /extra/evbmips64/releasedir/evbmips/installation/netbsd-INSTALL_MALTA64 -nographic -M malta

(I've decompressed the kernel)

Here's the output for qemu-system-mips64el --version :

QEMU emulator version 2.7.1(qemu-2.7.1-6.fc25), Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers

This doesn't look like a NetBSD bug. I've attached a screenshot of the working installation using gxemul in the attachments.



The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.

[Expired for QEMU because there has been no activity for 60 days.]