Hello Christophe, Il giorno lun, 24/08/2020 alle 07.17 +0200, Christophe Leroy ha scritto: > 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: [...] [ 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 [...] Bye, Giuseppe