# IAR and uIP

**URL:** <https://forums.freertos.org/t/iar-and-uip/3737>\
**Category:** Kernel\
**Created:** [November 17, 2006, 6:34pm UTC](https://forums.freertos.org/t/iar-and-uip/3737 "2006-11-17T18:34:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [November 17, 2006, 6:34pm UTC](https://forums.freertos.org/t/iar-and-uip/3737/1 "2006-11-17T18:34:44Z")

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**nobody** wrote on [Friday, November 17, 2006](https://sourceforge.net/p/freertos/discussion/382005/thread/a7fd9bf0/#0e9a):

I have downloaded FreeRTOSV4.1.2 and even 4.1.1 and keep experiencing the same error, with IAR 4.30A (Using Kickstart4.0) gives the same error message when first opening the project:

Broken Links Detected

A backup copy will be made

Here are the error messages:

LOAD: Configuration ‘Flash Debug’ in the project ‘rtosdemo’ contains broken options for tool ‘XLINK’:

&nbsp; The format of this file is not supported by this version of the workbench.&nbsp; It appears to have been written by a newer version of the workbench.

Diagnostics: ‘Settings ‘XLINK’: unsupported version - 18’.

&nbsp; Options for ‘XLINK’ will be set to default.

&nbsp; Creating backup of original project file.

LOAD: Configuration ‘Flash Release’ in the project ‘rtosdemo’ contains broken options for tool ‘XLINK’:

&nbsp; The format of this file is not supported by this version of the workbench.&nbsp; It appears to have been written by a newer version of the workbench.

Diagnostics: ‘Settings ‘XLINK’: unsupported version - 18’.

&nbsp; Options for ‘XLINK’ will be set to default.

WTD: Unavailable option selection: ‘Atmel AT91SAM7X256’.

WTD: Changed to default selection: ‘None’.

I have built a couple of the other projects just to check IAR and all build OK.&nbsp; Any light you can shine would be greatly appreciated.

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**Author:** ![rtel](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/rtel/32/31_2.png) [@rtel](https://forums.freertos.org/u/rtel)\
**Post date:** [November 17, 2006, 6:42pm UTC](https://forums.freertos.org/t/iar-and-uip/3737/2 "2006-11-17T18:42:00Z")

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**[rtel](https://sourceforge.net/u/rtel/)** wrote on [Friday, November 17, 2006](https://sourceforge.net/p/freertos/discussion/382005/thread/a7fd9bf0/#0e9a/a748):

Please download the latest version (4.40A?) from IAR - the KickStart is a free download.

The project file format seems to change with annoying regularity.&nbsp; You will probably have to install a clean version of [FreeRTOS.org](http://FreeRTOS.org) from the zip file download also.&nbsp; Using an older version of Embedded Workbench to open a project created from a newer version has in the past resulted in the project being clobbered - with all options being lost.

Let us know if this fixes the issue.

Regards.

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**Author:** ![fabtor](https://avatars.discourse-cdn.com/v4/letter/f/97f17d/32.png) [@fabtor](https://forums.freertos.org/u/fabtor)\
**Post date:** [November 22, 2006, 1:38pm UTC](https://forums.freertos.org/t/iar-and-uip/3737/3 "2006-11-22T13:38:00Z")

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**[fabtor](https://sourceforge.net/u/fabtor/)** wrote on [Wednesday, November 22, 2006](https://sourceforge.net/p/freertos/discussion/382005/thread/a7fd9bf0/#0e9a/acae):

Hi,

I compile uIP with gcc and i enable the UIP\_LOGGING for debugging with serial port.

When i connect to my board with ethernet cable, i receive the follow error:

"ip: invalid version or header length"

Why? Can you help me please?

Thanks!

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<div class="post-metadata">

**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [November 22, 2006, 1:43pm UTC](https://forums.freertos.org/t/iar-and-uip/3737/4 "2006-11-22T13:43:23Z")

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**nobody** wrote on [Wednesday, November 22, 2006](https://sourceforge.net/p/freertos/discussion/382005/thread/a7fd9bf0/#0e9a/acae/c2fa):

I suspect the structure packing is not correct.&nbsp; You have to use \_\_attribute\_\_ ((packed)).&nbsp; There was a post on the uIP mail list about this about a week ago you might want to look it up.