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PR/40604 CVS commit: src/sys/arch/alpha/pci

The following reply was made to PR port-alpha/40604; it has been noted by GNATS.

From: "Jason R Thorpe" <>
Subject: PR/40604 CVS commit: src/sys/arch/alpha/pci
Date: Sun, 18 Jul 2021 19:58:34 +0000

 Module Name:	src
 Committed By:	thorpej
 Date:		Sun Jul 18 19:58:34 UTC 2021
 Modified Files:
 	src/sys/arch/alpha/pci: tsp_dma.c
 Log Message:
 According to section of the Tsunami/Typhoon hardware reference
 manual (DS-0025A-TE), the SGMAP TLB is arranged as 168 locations of 4
 consecutive quadwords.  It seems that on some revisions of the Pchip,
 SGMAP translation is not perfectly reliable unless we align the DMA
 segments to the TLBs natural boundaries (observed on the API CS20).
 N.B. the Titan (as observed on a Compaq DS25) does not seem to have this
 problem, but we'll play it safe and run this way on both variants.
 PR port-alpha/40604.
 To generate a diff of this commit:
 cvs rdiff -u -r1.20 -r1.21 src/sys/arch/alpha/pci/tsp_dma.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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