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Memory Map
Uses CPU ID instruction.
Load CMOS/
NVRAM Defaults
Jumper settings correspond
to a table of SKUs for each
revision of the CPU.
PLL settings can be set
manually for debug.
Figure 7-4. GeodeROM Flow - GX Processor/CS5535 Device
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM Porting Guide
Reset
ROM
Fetch
N
CPU ID
Correct?
Y
CMOS/NVRAM
N
Valid and
Checksum
Ok?
Y
Failed to
Y
Boot
3 Times?
N
Early CS5535
Initialization
PLL Flag
indicates
2nd Pass?
N
Get Core and GLIU
Settings from Jumper
Settings or CMOS
CPU Speed to get
PCI Clock
DRAM Clock Setting
from SPD
Halt
Failed boots need a POR
reset and will always take this path.
Y
Set All Clocks
GLCP_SYS_RSTPPL
(MSR Addr. 4C00014h)
Set PLL Flag
Internal PLL Reset
32430C
Continue POST
PLL Reset completed
33
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