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| author | Reza Arbab <arbab@linux.vnet.ibm.com> | 2017-11-21 17:42:46 -0600 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-11-21 21:05:06 -0600 |
| commit | a752f2d908d1fd3d95cedf2b952729995ce53234 (patch) | |
| tree | 80affacfae92a2a0cbf15c7e615845769125efca /doc | |
| parent | 1c5417ec1898dbdd072495913d7fbc657e570e6f (diff) | |
| download | blackbird-skiboot-a752f2d908d1fd3d95cedf2b952729995ce53234.tar.gz blackbird-skiboot-a752f2d908d1fd3d95cedf2b952729995ce53234.zip | |
npu2: hw-procedures: Add check_credits procedure
As an immediate mitigator for a current hardware glitch, add a procedure
that can be used to validate NTL credit values. This will be called as a
safeguard to check that link training succeeded.
Assert that things are exactly as we expect, because if they aren't, the
system will experience a catastrophic failure shortly after the start of
link traffic.
Signed-off-by: Reza Arbab <arbab@linux.vnet.ibm.com>
Acked-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/nvlink.rst | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/nvlink.rst b/doc/nvlink.rst index f33574a8..4c893bb7 100644 --- a/doc/nvlink.rst +++ b/doc/nvlink.rst @@ -118,6 +118,7 @@ Procedure Control Register 10. Naples NPU - RESET 11. Naples PHY - PHY preterminate 12. Naples PHY - PHY terminated + 13. Witherspoon TL credit validation Procedure 5 (TX_ZCAL) should only be run once. System firmware will ensure this so device drivers may call this procedure mutiple |
