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AR# 29637

9.2i EDK, MPMC v3.00a - Cannot write to the 8th byte (last byte in aligned double word) when ECC is disabled

Description

MPMC works as expected when ECC is enabled.

When ECC is disabled afterward being enabled (by setting ECCCR from 0x0003 to 0x0000), writes fail to the 8th byte on a 8-byte boundary address (that is, 0x7, 0xE, 0x17, etc.). How do I work around this issue?

Solution

This issue can be worked around by ensuring the ECC is enabled at all times.

This issue is currently scheduled to be fixed in EDK 10.1i.

AR# 29637
Date Created 11/03/2007
Last Updated 12/15/2012
Status Active
Type General Article