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