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MEN-Mikro-Elektronik / 13MD05-90

MDIS5 System Package for Linux (including drivers)
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13md05-90 VME HW byte swappping #236

Open duagon-rvw opened 2 years ago

duagon-rvw commented 2 years ago

Customers renewing systems from A13 to A25 has seen a byte swap issue :

The HW byte swap has been deprecated as of the A21, with a new design of BARs setup. By reading the code, it looks like setting VME4L_SwapModeSet( spaceFd, VME4L_HW_SWAP1 ) may have a significant impact on the memory area accessed : It would make the physical address to point to the local SRAM instead of the remote VME address for A32D32 and A16D16 instead of A24D16 using flag VME4L_SW_ADR_SWAP also prevent to mmap VME memory as vme4l_mmap return invalid argument if the flag is passed.

VME byte swapping functionalities should be checked/redesigned and documentation adapted.

C. Schuster 2021.11.30: Review correct behaviour/supported features of various implementations!

dpfeuffer commented 1 year ago

This issue is the same as MAIN_PR007907