On 20.05.22 13:41, dabbede--- via Xenomai wrote: > Dear Xenomai community, > > I'm writing here because of the following issue: I have compiled a > xenomai-patched kernel that, when used on an Intel Atom E3950 (Apollo > Lake family), return the wrong cpu count (i.e. nproc returns 1 instead > of 4, and also lscpu claims CPU(s): 1). > The very same kernel, when run on an Intel i5-7440EQ, returns nproc=4, > which is correct. > I'm using CONFIG_GENERIC_CPU=y, and this, to my knowledge, should be a > safer option to handle both Atom and i5 or other platforms. I've also > tried to use CONFIG_MATOM or CONFIG_MCORE2 without noticeable > differences. > > I attach here the full config and the dmesg that I obtain on the two > platforms. Comparing the logs I've noticed the message "BIOS bug, no > explicit IRQ entries, using default mptable. (tell your hw vendor)" > but I'm not sure whether this is the cause or an effect of the > problem. > > Can you help me suggesting which CONFIG option I should change? >
[ 0.057400] Processor #0 (Bootup-CPU) [ 0.057403] BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor) [ 0.057412] Processors: 1 [ 0.057416] smpboot: Allowing 1 CPUs, 0 hotplug CPUs Seems first of all unrelated to Xenomai. Did you already try to compile a Xenomai/I-pipe free kernel with defconfig settings, whether that is able to detect all CPUs? If not, you should really look for a BIOS update of your board. Or complain with its vendor about breaking standards and, thus, Linux. Jan -- Siemens AG, Technology Competence Center Embedded Linux
