IMX8 - Linux Boot Time Optimization

duraip — Thu, 15 Sep 2022 09:57:13 GMT

Hi,

We are doing the boot time optimization on target board which has the emmc device as a storage device. Have observed that ext4 filesystem mounting takes longer time (750ms) and want to reduce this time. Already emmc runs with HS400 mode. Please find the below log,

[ 0.623431] mmc0: new HS400 MMC card at address 0001

[ 0.624105] mmcblk0: mmc0:0001 S0J35A 7.28 GiB

[ 0.624343] mmcblk0boot0: mmc0:0001 S0J35A partition 1 31.5 MiB

[ 0.624546] mmcblk0boot1: mmc0:0001 S0J35A partition 2 31.5 MiB

[ 0.624722] mmcblk0rpmb: mmc0:0001 S0J35A partition 3 4.00 MiB, chardev (244:0)

[ 0.625832] mmcblk0: p1

[ 1.365697] gpio-42 (scl): enforced open drain please flag it properly in DT/ACPI DSDT/board file

[ 1.365721] imx-lpi2c 37230000.i2c: using scl,sda for recovery

[ 1.365735] imx-lpi2c 37230000.i2c: can't get the TX DMA channel, error -19!

[ 1.372827] imx-lpi2c 37230000.i2c: error -ENODEV: dma setup error -19, use pio

[ 1.380884] i2c i2c-16: LPI2C adapter registered

EMMC info :

Device: FSL_SDHC

Manufacturer ID: 13

OEM: 14e

Name: S0J35

Bus Speed: 200000000

Mode: HS400 (200MHz)

Rd Block Len: 512

MMC version 5.1

High Capacity: Yes

Capacity: 7.3 GiB

Bus Width: 8-bit DDR

Erase Group Size: 512 KiB

HC WP Group Size: 8 MiB

User Capacity: 7.3 GiB WRREL

Boot Capacity: 31.5 MiB ENH

RPMB Capacity: 4 MiB ENH

Boot area 0 is not write protected

Boot area 1 is not write protected

Can anyone help me on this issue?

Regards

Durai

Re: IMX8 - Linux Boot Time Optimization

Bio_TICFSL — Mon, 19 Sep 2022 14:03:30 GMT

Hello,

That log only means there are 750ms between the two log lines, it doesn't mean emmc cost 750ms to mount.

[ 0.625832] mmcblk0: p1

[ 1.365697] gpio-42 (scl): enforced open drain please flag it properly in DT/ACPI DSDT/board file

In normal case, to reduce the boot time, customer needs reduce the kernel size and rootfs size, this is out of NXP support, customer needs handle it based on their real product.

Regards

topic IMX8 - Linux Boot Time Optimization in i.MX Processors

IMX8 - Linux Boot Time Optimization

Re: IMX8 - Linux Boot Time Optimization