AMD-751 Datasheet, PDF (7/14 Pages) Advanced Micro Devices – AMD-751-TM System Controller Revision Guide

22564B-1—February 2000
Preliminary Information
AMD-751™ System Controller Revision Guide
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PCI ARB_DIS Bit Set When DMA is Active
Products Affected. C3 and C5
Description. If DMA is active when ARB_DIS is set, the system can hang.
Potential Effect on System. System hang could occur.
Suggested Workaround. Prior to setting ARB_DIS, software suspends all DMA activity.
Resolution Status. Fixed in a future revision of the AMD-751 system controller.
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GART Requestors Do Not Work With TLB Caches Off
Products Affected. C3 and C5
Description. Only partial support exists for the mode where GART TLB caches are disabled. GART
caches disabled was intended primarily for performance evaluation, and is not supported.
Potential Effect on System. None
Suggested Workaround. The BIOS should set BAR1: Offset 02h bit 2.
Resolution Status. None required, proper operation
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