MAC7200 datasheet(201/976 Pages) FREESCALE

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System Boot Sequence

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

123

9.18

System Boot Sequence

9.18.1

Programming with a Bootloader

Programming House

Program the Primary Bootloader code into the Shadow Block via the JTAG port

•

Done in Normal/Secured Bootloader Mode with the core in debug mode

•

Primary Bootloader code is usually less than 20KB

•

Branch to Primary Bootloader loaded into Reset Vector ($0000 0000)

•

Flash is unsecured

First Sub-Supplier

Boot the device from the Shadow Block (Normal/Secured Bootloader Mode)

•

Primary Bootloader checks for empty Flash Main Array

Flash is empty

Flash is not empty

First Sub-Supplier

Program application code into the Flash Main Array

•

Primary Bootloader loads Secondary Boot Loader (SBL) into the SRAM via a

pre-defined peripheral/protocol (Flash is secured, so JTAG is disabled)

•

SBL is temporary - Only to program the application code into the Flash array

•

Requires that all ISRs reside in SRAM => Primary Bootloader relocates SRAM

to address $0000 0000 (Flash stays at address $2000 0000)

•

SBL loads the application code (via a pre-defined peripheral/protocol) into the

Flash Main Array at address $2000 0000

•

SBL relocates FLASH to address $0000 0000 and SRAM back to address

$4000 0000

(No application code)

Application

Execute application code at address $0000 0000

•

Relocate Flash to address $0000 0000 (Use exception table from the application code)

•

Jump to address $0000 0000

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