# Is it not official support Linux Distribution for using RS232C?

**URL:** <https://forum.legato.io/t/is-it-not-official-support-linux-distribution-for-using-rs232c/4905>\
**Category:** Legato Linux distribution (Yocto project)\
**Created:** [December 12, 2019, 12:59am UTC](https://forum.legato.io/t/is-it-not-official-support-linux-distribution-for-using-rs232c/4905 "2019-12-12T00:59:04Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![tanoue](https://avatars.discourse-cdn.com/v4/letter/t/67e7ee/32.png) [@tanoue](https://forum.legato.io/u/tanoue)\
**Post date:** [January 22, 2020, 4:20am UTC](https://forum.legato.io/t/is-it-not-official-support-linux-distribution-for-using-rs232c/4905/7 "2020-01-22T04:20:42Z")

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Hi goto-san,

Thank you for answering my problem.  
I could check RS232C pin were controlled by my application on the provided Yocto image.

Then, I have two additional question.

1. 

Is controlling RS232C the only difference between the provided Yocto image(Customized R13.3) and a Yocto image(Original R13.3) ?  
In other words, I think the difference is that a image includes the customized “gpiolib-sysfs.c” or not.

> [@UART flow control with WP7608](https://forum.legato.io/t/uart-flow-control-with-wp7608/4597/12):
>
> Please see my modification on yocto/kernel/driver/gpio/gpiolib.c. [gpiolib-sysfs.c](https://forum.legato.io/uploads/short-url/nyElRDOmod5pxTdUZS5SFw6h5mj.c) (36.7 KB)

1. 

Is the provided URL always accessible?  
I am worried about the URL downs and I need a workaround to get it.

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