Code is added to the channel read routines to indicate that no data was transfered when waiting for available data times out. Previously it was possible for a read to retry indefinitely if the timeout occurred on the first transfer for a given read operation.

Several modifications are made to reduce the stack usage in the driver. This has not been a problem until recent versions of Kernel, including the Kernel distributed with Red Hat Enterprise Linux 3.

To avoid these problems when used in host systems with a 66 MHz PCI clock, the DPT4 boards require a modification to force the PCI bus clock to run at 33 MHz. New DPT4 boards will be shipped with this modification. Customers with exisiting boards that are to be run in systems with 66MHz PCI slots should contact CAC to request an RMA to have the modification done as a repair item or for details on how to perform the modification.

Boards that have this modification are identified with an assembly option flag stored in the EEROM on the board. New versions of the dpinfo and dpserial programs indicate boards that have this modification as part of the "assembly options" category.

For older versions of these programs that do not include "PCI66MHz" on the display line for assembly options, the setting can be determined by running the dpserial program with the -v option to display the data contents of the EEROM. The PCI66MHz flag is located in 4th bit of the 10th word of the EEROM. This is the third group of 4 hexadecimal values on the line beginning with "08:". If the 3rd digit of that group is a 1, the board has been identified as having the modification.

The work-around for bugs in the PCI interface chip used on the DPT4 board includes a retry data pattern. When the board is unable to respond to a read access from the host system within a minimum number of PCI clocks, a special "retry" data pattern is returned. The API, as well as the device drivers, check for the pattern and retry the access. Accesses are retried until the retry pattern is not seen or the retry limit is reached in which case it is assumed that the retry pattern is actually the data being read from the board.

Newer systems that can perform reads much quicker are likely to reach the old limit and assume incorrectly that the retry data pattern is the correct data. This problem had been causing system errors when the data being read was used to indicate buffer addresses on the board.

A new function, pci_up_dma16b, is added to the API for uploading arrays of 16-bit objects via DMA.

The pci_read_chan function is fixed to set the value of errno for cases where the error code is provided by the embedded application.

The dpinfo and dpserial programs now include indication of the board's PCI 66MHz disable assembly option. The dpserial program includes the ability to set this option.

The dp54xdiag program is fixed to always initialize the framers. It used to not initialize them when DSP TDM loop-back mode was selected.

The dpdmaxfer program includes testing of the new pci_up_dma16b API function. The program is also modified to use _dpstrerror() for reporting error codes and has two new command line options:

-d to specify a delay between test iterations and between each DMA read within the batch mode iterations.

-q to suppress the display of details after the first test iteration.

The dpchantest program now ignores timeouts that occur the first time a receive channel is read. It is also fixed to use a separate flag for each receive thread to indicate that the first word should be ignored when the sync header is suppressed. The program also has some additional command line options:

-T Use the upper byte of each 32-bit word of test data as a tag to indicate which framer it is for.

-Z delay between opening and starting each transmit and receive thread.

The dprec program is fixed to properly detect loss of sync and is modified to use _dpstrerror() for reporting error codes.

The dpreceive example program code is fixed to properly detect loss of sync and to use _dpstrerror() for reporting error codes.

The components and their versions for DPT4 Software Release 1.4.5 are:

Component:	Version:
API Library and Programs	1.4.5
Solaris Device Driver	1.4.5
Linux Device Driver	1.4.5
Windows Device Driver	1.4.5
Embedded MIPS Loader	1.4.0
Embedded MIPS Application	1.4.8
PLD Configuration	1.4.0
Host FPGA Configuration	1.4.5
Expansion FPGA Configuration	1.4.0