hello everyone. I just followed the instruction at “https://www.digikey.com/eewiki/display/linuxonarm/PICO-PI-IMX7”, and after several attempts, it finally boot up sucessfully, with wifi and audio working .
one remaining issue is, it only use 1 cpu core at 1.0GHz (cat /proc/cpuinfo only show up 1 cpu, and benchmark also confirm this fact), instead of two 1.2GHz CPUs on the board. could you please give me some suggestions how to fix this issue. Thanks.
kernel version: 5.1.18-armv7-lpae-x14.4
U-Boot 2019.07-rc4 (Jul 23 2020 - 13:16:43 +0000)
CPU: Freescale i.MX7D rev1.2 1000 MHz (running at 792 MHz) CPU: Commercial temperature grade (0C to 95C) at 46C Model: TechNexion PICO-IMX7D Board and PI baseboard Board: i.MX7D PICOSOM ... Retrieving file: /boot/dtbs/5.1.18-armv7-lpae-x14.4/imx7d-pico-pi.dtb ... Starting kernel ... [ 1.401300] spi_imx 30840000.spi: dma setup error -19, use pio [ 1.472111] CPUidle arm: CPU 0 failed to init idle CPU ops SELinux: Could not open policy file <= /etc/selinux/targeted/policy/policy.31: No such file or directory [ 2.763351] mmc1: error -110 whilst initialising SDIO card ...