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Can't scan jtag chain containing Spartan-6 FPGA #3

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opened 2012年06月30日 05:23:51 +02:00 by gsmcmullin · 1 comment
gsmcmullin commented 2012年06月30日 05:23:51 +02:00 (Migrated from github.com)
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The current jtag scan code assumes that all devices shift our IR as 0x01.
This isn't always true, as the Spartan-6 FPGA shifts out 0x11 and is detected as two devices.
The sanity check of switching all devices to bypass and counting again fails and the scan is aborted.

It should be possible to specify IR lengths for cases like this.

The current jtag scan code assumes that all devices shift our IR as 0x01. This isn't always true, as the Spartan-6 FPGA shifts out 0x11 and is detected as two devices. The sanity check of switching all devices to bypass and counting again fails and the scan is aborted. It should be possible to specify IR lengths for cases like this.
gsmcmullin commented 2012年07月05日 10:46:45 +02:00 (Migrated from github.com)
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This issue is fixed in commit 53af978295.

Specify IR lengths on the command line (devices closer to TDO first):

(gdb) mon jtag_scan 6 4 5
This issue is fixed in commit 53af978295ad1faa982a1af21219eea19d270cd9. Specify IR lengths on the command line (devices closer to TDO first): <pre> (gdb) mon jtag_scan 6 4 5 </pre>
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