Specifications

AMD Geode™ GeodeROM Functional Specification 255
19
Debugging 32087C
19.0Debugging
19.1 MTEST PINS:
MTEST is a Geode processor feature that generates special debug information used by hardware engineers to trace pro-
gram execution. MTEST disables cache and DIMM1.
DO NOT enable this feature if you do not plan on using it.
19.2 GPCS#
The GPCS (General Purpose Chip Select) can be set to activate on I/O reads and writes to a 16-bit I/O location with a width
of 1 to 32 bytes. This can be used to monitor Port 80h writes on a system that has no other way to provide access to I/O
writes to Port 80h.