maxcpu's settings in Uboot.

kumarabhimeswar — Thu, 07 May 2015 11:56:50 GMT

Hi ,

I am working on Sabre auto board. There are 4 cpus running on linux kernel.

In Bootargs i set maxcpus as 1 at Uboot. So that during initial boot time kernel boots with single CPU to reduce 300ms boot time.

Later after mounting the file system using sysfs i tried to enable the rest of CPU's. But rest of 3 CPU's were not enabled.

Scrip ran :

echo 1 > /sys/devices/system/cpu/cpu[123]/online

Verified with :

cat /proc/cpuinfo

Regards,

Bhimesh.

Re: maxcpu's settings in Uboot.

Yuri — Tue, 12 May 2015 07:37:41 GMT

I am afraid, it is not possible to enable / disable CPUs after boot maxcplus option.

The sysfs allows to change CPU states dynamically (online / offline), assuming all

needed CPUs are enabled during initialization.

Have a great day,
Yuri

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i.MX Processorsのトピックmaxcpu's settings in Uboot.

maxcpu's settings in Uboot.

Re: maxcpu's settings in Uboot.