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can the bar region be as large as 256 MB or more?
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The PCIe spec will not stop you, but your particular hardware might. My EliteBook will not boot with a BAR of 256MB.
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We use "system"-> "assign base address" menu, the DDR now is mapped to 0x0000_0000 to 0x0fff_ffff, the on-chip memory now is mapped to 0x1000_0000 to 0x1003_ffff.
But it still doesn't work. Bar0 still does not appear.
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Because you did not change the BAR size by doing this. Look at the report on the Qsys GUI. Look at the synthesis report.
Look at this document here:
http://www.alteraforum.com/forum/showthread.php?t=35678 It has some comments.
To try and isolate this problem, start with just the on-chip RAM in the BAR at a base address of zero. You can use the "Address Map" tab to re-assign the addresses.
Once you can confirm that you can boot windows, you can increase the size of the BAR (the offset of the on-chip RAM) until it breaks. Then you will know the limits for your particular hardware setup.
Cheers,
Dave
Honored Contributor
