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