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The workaround applies to the Linux kernel source. This consists of applying a patch set available on the Timesys Git Tree and enabling EDMA in the UART configuration. For convenience this has been incorporated into one patch that can be applied directly to the PD13.1.0 Linux kernel.

Info

Note:

The patch set was obtained from the Timesys PCM052 linux-2.6-mx Git repository. The 20140113 Desktop factory applies up to patch 3.0-pcm052-ts2.6 (linux-3.0.15-pcm052-ts2.6.patch) to the Linux source. The patch applies all UART specific commits as well as some additional fixes including:

(2014-02-25) 3.0-pcm052-ts2.93.0-pcm052Fixed a panic seen as soon as you type a character on the terminal when EDMA

kernel BUG at kernel/workqueue.c:1037! Unable to handle kernel NULL pointer dereference at virtual address 00000000

(2014-02-25) Disabled EDMA in UART Configuration to prevent jumbled characters on serial p...
(2014-02-25) Fixed the uart_tasklet_action NULL pointer deference panic in MVF Serial Driver
(2014-02-25) Support for setting TX clear-to-send in set modem CTRL in MVF Serial Driver
(2014-02-25) MVF Serial Driver Improvements to fix the sysvinit console hang issue
(2014-02-25) Removed dead code, corrected comments, print uart settings in MVF Serial Driver
(2014-01-23) Add missing header for __exception_irq_entry in global timer
(2014-01-23) Add missing Global Timer source file
(2014-01-23) Add Global Timer support to fix High Resolution Timer functionality
(2013-11-21) Fix typo in DSPI2 and DSPI3 base address

Download the patch from the PHYTEC FTP: ftp://ftp.phytec.com/

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