Update grut699-vxworks6 cfe_psp_timer.c per white box unit testing results

[skliper]

During white box testing the following issue was identified with the grut699-vxworks6 version of cfe_psp_timer.c

• CFE_PSP_Get_Timebase - possible divide by zero in the calculation:

lower /= sysTimestampFreq() / 1000000UL

if sysTimestampFreq() returns a number less than 1000000UL.

Issue identified during #14 white box testing commit: [changeset:eade737]

[skliper]

Imported from trac issue 36. Created by dasp on 2015-08-13T19:13:00, last modified: 2019-05-06T11:51:35

[skliper]

Trac comment by sduran on 2015-08-17 11:50:52:

If sysTimestampFreq() returns a value less then 1000000UL, it would mean the processor's system clock is less than 1MHz - The SPARC runs at 25MHz and higher, 75MHz on our test board, >=100MHz for Orion. Since this PSP is only for the ut699 SPARC Leon3, I think it is safe to say that we will not be using this code on a processor running less than 1MHz.

[skliper]

Trac comment by abrown4 on 2015-09-01 20:16:18:

In #15 Steve made a change to cfe_psp_timer.c that removes this division entirely, commit: [changeset:db39700], on Trac #14 branch.

[skliper]

Trac comment by abrown4 on 2015-09-01 20:17:18:

Unit test needs to be updated to remove the failing placeholder test.

[skliper]

Trac comment by abrown4 on 2015-09-02 12:14:06:

commit: [changeset:9976a8c] PSP Trac #14 & #15 Updated PSP timer white-box for commit db39700 (cfe_psp_timer.c).

This ticket's intent is completed.

[skliper]

Trac comment by jhageman on 2019-05-06 11:51:35:

Specific to non-community PSP so closing as invalid. Note changes were merged to techdev-pc-linux-uei, techdev-sp0-vxworks6.9 branches (but not techdev-ut699 for some reason). Not in framework release.