# WP77XX I2C Bus Issues Migrating from Rel14.1 to Rel15.1

**URL:** <https://forum.legato.io/t/wp77xx-i2c-bus-issues-migrating-from-rel14-1-to-rel15-1/6582>\
**Category:** Uncategorized\
**Created:** [August 30, 2023, 3:12am UTC](https://forum.legato.io/t/wp77xx-i2c-bus-issues-migrating-from-rel14-1-to-rel15-1/6582 "2023-08-30T03:12:11Z")\
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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [August 31, 2023, 1:57am UTC](https://forum.legato.io/t/wp77xx-i2c-bus-issues-migrating-from-rel14-1-to-rel15-1/6582/16 "2023-08-31T01:57:47Z")

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I don’t see problem to use mksys to compile in leaf shell with “swi-wp77\_6.0.1” which is using R15.1+ legato 21.05.0.  
I can compile the .update file:

```auto
(lsh:wp77) owner@owner-ThinkPad-X220:~/LEAF/wp77$ ls -l ./fx30.wp77xx.update 
-rw-rw-r-- 1 owner owner 10352787 Aug 31 09:51 ./fx30.wp77xx.update

```

I used this command to compile:  
`mksys fx30.sdef -s components -t wp77xx`

Here is my fx30.sdef:  
[fx30.sdef](https://forum.legato.io/uploads/short-url/2KgdCIgWASHz3rOPYlORvHZg7Er.sdef) (2.6 KB)

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