# FreeRTOS+FAT: ff\_ftell() Oddities

**URL:** <https://forums.freertos.org/t/freertos-fat-ff-ftell-oddities/10976>\
**Category:** Libraries\
**Created:** [October 24, 2020, 12:59am UTC](https://forums.freertos.org/t/freertos-fat-ff-ftell-oddities/10976 "2020-10-24T00:59:32Z")\
**Posts on this page:** 1\
**Showing post:** 19

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**Author:** ![carlk3](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/carlk3/32/266_2.png) [@carlk3](https://forums.freertos.org/u/carlk3)\
**Post date:** [April 2, 2021, 4:46am UTC](https://forums.freertos.org/t/freertos-fat-ff-ftell-oddities/10976/19 "2021-04-02T04:46:51Z")

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> [@rtel](#):
>
> I would be grateful if you could keep us informed so we can see if there is anything we can do to upstream the changes.

I have a working solution:

> [@Extending the xPortPendSVHandler save area for ARM\_CM0](https://forums.freertos.org/t/extending-the-xportpendsvhandler-save-area-for-arm-cm0/12047/9):
>
> Thanks so much, Jeff! The version that runs: [port.c](https://forums.freertos.org/uploads/short-url/wVZ8QUeW2zWSCRFB5hvYeq0EeCc.c) (24.9 KB)

but, apparently, Raspberry is working on their own port that will have a more efficient solution. See [Context switching breaks SPI/DMA - Page 2 - Raspberry Pi Forums](https://www.raspberrypi.org/forums/viewtopic.php?f=145&t=306717&p=1845415#p1845415)

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