[Qemu-devel] [Bug 1579327] Re: emulation of vexpress-a9 vexpress-a15 in multicore mode seems to be broken

[Peter Maydell]

Does the u-boot binary you're running expect to work with SMP? Usually
"Trying to execute code outside RAM or ROM" means "the guest binary did
something badly wrong and jumped off to an invalid address", rather than
being a QEMU bug.

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https://bugs.launchpad.net/bugs/1579327

Title:
  emulation of vexpress-a9 vexpress-a15 in multicore mode seems to be
  broken

Status in QEMU:
  New

Bug description:
  Report based on:
  
https://stackoverflow.com/questions/37068688/have-you-got-issues-with-running-u-boot-for-versatile-express-a9-platform-under

  I don't see any bug reports about vexpress boards emulation here, so I
  decided to let you know:

  version tested: qemu 2.0.0 on 32 bit Debian GNU/Linux

  There are issues with running u-boot on qemu vexpress-a9 ( it was reported to 
work ok at physical multicore board )  and vexpress-a15 with parameters -smp 
cores=2 r 3 or 4.
  So far those are two tested. I dont know ATM if any other board emulation 
works in multiprocessor mode

  Original post at stackoverflow:
  
---------------------------------------------------------------------------------------------------
  I have tried numerous releases of u-boot since vexpress-a9 was introduced in 
u-bot stable release. Under qemu with multicore emulation its behaving unstable 
- mostly crashes instantly after loading. Sometimes it loads without issues but 
its rare. My version of qemu is 2.0.0 on x86 32bit Debian. I would be 
interested to hear if you succeeded in runing it under qemu with multicore 
emulation ( if yes which version of qemu and u-boot ) or physical versatile 
express board with multiple cores.

  Example outputs are

  $ qemu-system-arm -M vexpress-a9 -nographic -kernel u-boot -smp cores=2
  U-Boot 2013.01.01-dirty (May 05 2016 - 08:27:19)

  DRAM:  128 MiB
  WARNING: Caches not enabled
  undefined instruction
  pc : [<00000000>]      lr : [<00000000>]
  sp : 60000ef0  ip : 67eedfd8     fp : 00000000
  r10: 00000000  r9 : 00000000     r8 : 60000f00
  r7 : 00000000  r6 : 608146ac     r5 : 60828365  r4 : 0000004d
  r3 : 00000000  r2 : 00000000     r1 : 60000f80  r0 : 47cc9e10
  Flags: nzcv  IRQs on  FIQs on  Mode USER_26
  Resetting CPU ...
  resetting ...
  Flash: 256 MiB
  MMC:   MMC: 0
  *** Warning - bad CRC, using default environment

  In:    serial
  Out:   serial
  Err:   serial
  Net:   smc911x-0
  Warning: smc911x-0 using MAC address from net device

  Hit any key to stop autoboot:  0 
  Wrong Image Format for bootm command
  ERROR: can't get kernel image!
  VExpress# 

  This time it was loaded

  Other time it was not...

  $ qemu-system-arm -M vexpress-a9 -nographic -kernel u-boot -smp
  cores=2

  
  U-Boot 2013.01.01-dirty (May 05 2016 - 08:27:19)

  DRAM:  128 MiB
  WARNING: Caches not enabled

  
  U-Boot 2013.01.01-dirty (May 05 2016 - 08:27:19)

  DRAM:  128 MiB
  WARNING: Caches not enabled
  Flash: 256 MiB
  MMC:   MMC: 0
  *** Warning - bad CRC, using default environment

  In:    serial
  Out:   serial
  Err:   serial
  Net:   smc911x-0
  Warning: smc911x-0 using MAC address from net device

  Hit any key to stop autoboot:  2 qemu: fatal: Trying to execute code
  outside RAM or ROM at 0x6f71c004

  R00=00418937 R01=000003e8 R02=00418937 R03=00000000
  R04=00000000 R05=67eedf58 R06=67f8e000 R07=00000002
  R08=00418937 R09=0778e000 R10=6082f688 R11=00000000
  R12=67eedfd8 R13=00000000 R14=67fb82c0 R15=6f71c004
  PSR=200001db --C- A und32
  s00=00000000 s01=00000000 d00=0000000000000000
  s02=00000000 s03=00000000 d01=0000000000000000
  s04=00000000 s05=00000000 d02=0000000000000000
  s06=00000000 s07=00000000 d03=0000000000000000
  s08=00000000 s09=00000000 d04=0000000000000000
  s10=00000000 s11=00000000 d05=0000000000000000
  vs12=00000000 s13=00000000 d06=0000000000000000
  s14=00000000 s15=00000000 d07=0000000000000000
  s16=00000000 s17=00000000 d08=0000000000000000
  s18=00000000 s19=00000000 d09=0000000000000000
  s20=00000000 s21=00000000 d10=0000000000000000
  s22=00000000 s23=00000000 d11=0000000000000000
  s24=00000000 s25=00000000 d12=0000000000000000
  s26=00000000 s27=00000000 d13=0000000000000000
  s28=00000000 s29=00000000 d14=0000000000000000
  s30=00000000 s31=00000000 d15=0000000000000000
  s32=00000000 s33=00000000 d16=0000000000000000
  s34=00000000 s35=00000000 d17=0000000000000000
  s36=00000000 s37=00000000 d18=0000000000000000
  s38=00000000 s39=00000000 d19=0000000000000000
  s40=00000000 s41=00000000 d20=0000000000000000
  s42=00000000 s43=00000000 d21=0000000000000000
  s44=00000000 s45=00000000 d22=0000000000000000
  s46=00000000 s47=00000000 d23=0000000000000000
  s48=00000000 s49=00000000 d24=0000000000000000
  s50=00000000 s51=00000000 d25=0000000000000000
  s52=00000000 s53=00000000 d26=0000000000000000
  s54=00000000 s55=00000000 d27=0000000000000000
  s56=00000000 s57=00000000 d28=0000000000000000
  s58=00000000 s59=00000000 d29=0000000000000000
  s60=00000000 s61=00000000 d30=0000000000000000
  s62=00000000 s63=00000000 d31=0000000000000000
  FPSCR: 00000000
  
-------------------------------------------------------------------------------------------------
  end of post

  Original discussion at ( includes comments of head custodian of Das U-boot 
about u-boot working on physical board versatile express a9 and him having 
issues with runing Linux distro at qemu vexpress-a9 board emulation ):
  
https://stackoverflow.com/questions/37068688/have-you-got-issues-with-running-u-boot-for-versatile-express-a9-platform-under

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