uClinux for Kinetis K70 using TWR-K70F120M-KIT as a reference platform is available here:
Here is a pointer to the video of a live uClinux session running on the Freescale Kinetis K70:
Linux (uClinux) runs just beatifully on this device. Using 'dhrystone', we get about 50% performance we get on a 250Mhz Freescale PowerPC box. Fast boot-up, lots of RAM (the TWR-K70 module provides 128MB of RAM and 256MB of NAND Flash), networking, JFFS2, framebuffer, SSH, HTTPD, Qt/E - all this runs just fine on K70. Overall user experience is your regular "embedded Linux" on an MMU-full microprocessor.
There is a possibility to run uCLinux on Kinetis K70 as usb device - cdc - serial emulator? And uCLinux supports usb as mass storage device?
In our custom board we couldn't use ethernet, we only have uart or usb connections to the board.
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