NXP Semiconductors UM11490 - Enable Dmesg Logs for Device in Supended State; High Throughput, DDR Frequency, and AXIHP Bus Frequency

NXP Semiconductors
UM11490
Feature Configuration Guide for NXP-based Wireless Modules on i.MX 8M Quad EVK
2.10.1 Enable dmesg logs for device in supended state
Step 1 - Boot the i.MX 8M Quad EVK to the U-boot console
U-Boot >
Step 2 - Enable dmesg logs while the device is in suspended state
U-Boot > setenv mmcargs $mmcargs no_console_suspend
Step 3 - Boot the i.MX 8M Quad EVK
U-Boot > boot
2.10.2 High throughput, DDR frequency, and AXIHP bus frequency
This section shows how to configure PCIe bus frequency to high power mode and
achieving a higher throughput. It also provides the step to reverse to low power mode.
• Enable high throughput using high power mode
root@imx8mqevk:# echo 1 >> /sys/devices/platform/soc@0/33c00000.pcie/
bus_freq
[ 204.287147] imx6q-pcie 33c00000.pcie: pcie request bus freq high
• Set low power mode
root@imx8mqevk:# echo 0 >> /sys/devices/platform/soc@0/33c00000.pcie/
bus_freq
[ 252.812327] imx6q-pcie 33c00000.pcie: pcie release bus freq high
UM11490 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved.
User manual Rev. 2 — 29 January 2021
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