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005-tilegrid: added comment on EXCLUDE_ROI env variable 

Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>
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Alessandro Comodi 2020-01-20 12:12:05 +01:00
parent 5db213293c
commit 4849f49724
1 changed files with 15 additions and 0 deletions
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fuzzers/005-tilegrid/README.md
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@ -19,6 +19,21 @@ Finally, generate.py calculates the segment word offsets based on known segment
This environment variable must be set with a valid ROI.
See database for example values
### XRAY_EXCLUDE_ROI_TILEGRID
This environment variable must be set in case the part selected does not allow some tiles to be
locked.
Error example (when using the artix 200T part):
`ERROR: [Place 30-25] Component carry4_SLICE_X82Y249 has been locked to a prohibited site SLICE_X82Y249.`
To avoid this error, the `XRAY_EXCLUDE_ROI_TILEGRID` defines an ROI that is not taken into account
when building the tilegrid, therefore excluding the problematic un-lockable sites.
As the resulting output file, `tilegrid.json`, is going to be checked against the one produced in
the `074-dump_all` fuzzer, also the latter one needs to produce a reduced tilegrid, with the excluded
tiles specified with the environment variable.
### XRAY_ROI_FRAMES
This can be set to a specific value to speed up processing and reduce disk space
If you don't know where your ROI is, just set to to include all values (0x00000000:0xfffffff)