Hello Giuseppe,

Le 24/08/2020 à 22:48, Giuseppe Sacco a écrit :
Hello Christophe,

Il giorno lun, 24/08/2020 alle 07.17 +0200, Christophe Leroy ha
Hello Giuseppe,
The Oopses in the video are fixed in 5.9-rc2, see my response to your
other mail.

Right, I just updated from git and rebuilt the kernel whith
CONFIG_VMAP_STACK not set and the machine boots correctly.

So now we know that your kernel doesn't boot when CONFIG_VMAP_STACK is set.
Can you remind the exact problem ?

latest kernel with CONFIG_VMAP_STACK set stops after writing:
pmac32_cpufreq: registering PowerMac CPU frequency driver
pmac32_cpufreq: Low: 667 MHz, High: 867 Mhz, Boot: 667 MHz

One common problem with CONFIG_VMAP_STACK is when some drivers are
invalidly using buffers in stack for DMA.

Couldn't try with CONFIG_DEBUG_VIRTUAL (without CONFIG_VMAP_STACK) and
see if it triggers some warnings ?

I've just tried: it boots without any special warning. What should I
look for? This is an excerpt of dmesg output about the line it would
otherwise stop:

If there is no warning, then the issue is something else, bad luck.

Could you increase the loglevel and try again both with and without VMAP_STACK ? Maybe we'll get more information on where it stops.


[ 6.566984] PowerMac i2c bus pmu 2 registered
[ 6.574879] PowerMac i2c bus pmu 1 registered
[ 6.582634] PowerMac i2c bus mac-io 0 registered
[ 6.590323] i2c i2c-2: No i2c address for /pci@f2000000/mac-io@17/i2c@18000/i2c-modem
[ 6.598290] PowerMac i2c bus uni-n 1 registered
[ 6.606196] i2c i2c-3: i2c-powermac: modalias failure on /uni-n@f8000000/i2c@f8001000/cereal@1c0
[ 6.614320] PowerMac i2c bus uni-n 0 registered
[ 6.622501] pmac32_cpufreq: Registering PowerMac CPU frequency driver
[ 6.630580] pmac32_cpufreq: Low: 667 Mhz, High: 867 Mhz, Boot: 667 Mhz
[ 6.639518] ledtrig-cpu: registered to indicate activity on CPUs
[ 6.647894] NET: Registered protocol family 10
[ 6.656492] Segment Routing with IPv6
[ 6.664490] mip6: Mobile IPv6
[ 6.672337] NET: Registered protocol family 17
[ 6.680213] mpls_gso: MPLS GSO support


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