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Design and implementation of the operation and maintenance software for a new GSM transcoder - page 14 / 26

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© NOKIA14 paavo.markkola@nokia.com18.10.2005

Implementation, Boot Procedure

Two phased boot procedure

In the first phase boots from flash

Copy everything from flash to RAM

Using only host processor’s registers

The first phase completed when I/O pin is turned by software

Memory configuration is altered

Next instruction is fetched from the same address in RAM

Flash and DSP code loading memories are now mapped to 64 kB areas after 256 kB data memory

Second phase then initializes hardware devices

flash

RAM

LCS

Data

FFFFFH

00000H

UCS

RAM

FFFFFH

80000H

UCS

00000H

40000H

Flash and

DSP

LCS

MCS

80000H

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