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ARM Development Board FAQ2

Posted 2014/07/02 01:23 AM by Qiyang views: 1129

1. Q: When I do [ubi]file system, execute [sudo mkfs.ubifs -r rootfs/ -F -o ubifs.img -m 2048 -e 126976 -c 1580]command, it hints [mkfs.ubifs: invalid option -- 'F'

Usage: mkfs.ubifs [OPTIONS] target

Make a UBIFS file system image from an existing directory tree

[Examples:]

A: Please confirm whether the path is correct,whether the extracting of the file system is correct.

If the path is correct, please confirm whether the [mkfs.ubifs] is using from CD disk, if you use which the system owned, it may do not support [-F] parameter.

2. Q: How to solve lossing data problem when lost the electricity of the UBI file system.

A: Modify[/etc/init.d/mountall.sh],add [mount -o sync,remount,rw / /].

3. Q:If 335X USB circuit remove 2026 chip, is it workable by connecting 5V ?

A: Yes,it is workable.

4. Q: How to set resulution on I.mx6?

A:setenv bootargs_mmc 'setenv bootargs ${bootargs} root=/dev/mmcblk0p1 rootfstype=ext4 rootwait video=mxcfb0:dev=lcd,QY-LCD,800x600M@60,if=RGB24'

5. Q: [gplay] support video format ?

A: It do not support [rmvb][wmv][asf], the audio frequency do not support [wma][ra].

6. Q:Why there is a error when Cortex-A5 compiling file system ?

[mkfs.ubifs: error while loading shared libraries: liblzo2.so.2: cannot open shared object file: No such file or directory]

A:It is workable for lacking of [liblzo2-dev,sudo apt-get install liblzo2-dev]

7. Q: What is DD3 frequency ?

A:532MHz

8. Q: What is bluetooth's baseband frequency?

A:2.45GHz

9. Q: Which frame format does the LCD displayer support ?

A:There is no select port for frame frequency, it matched through frequency.

10. Q:What is RFID system's main working frequency and valid recognition distance?

A:Low frequency:125-134kHz,recognition distance <1m:ultrahigh frequency 902-928MHz,recognition distance 4-8m: Microwave 2.54GHz, recognition distance to 100m. RFID recognition distance could from centimeter to 10+ meter.The application range is very extensively.