EB632 datasheet(87/112 Pages) FREESCALE

87 / 112 page

Bootloader Program

Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2

Freescale Semiconductor

move.l d3,r3

nop

; FIND IMMR FROM ISB

;r3 *= 4 so the offset will be in long instead of bytes

;r3 = r3<<2

asl2a r3

;put the address of the external memory boot table in r4

move.l #EXTERNAL_MEM_BOOT_TABLE,r4

nop

adda r4,r3

nop

;move the address from the table into r3

move.l (r3),r3

nop

;jump to that address

jmp r3

to_boot_bypass

jmp BOOT_BYPASS_ADD

nop

from_host

; software watch dog is not disabled

; it will be handled in the load_from_fifo routine if it is enabled

move.l #$0,d15;clear d15, software watchdog is not enabled

move.l (r6+$4),d1;get sypcr value

bmtsts #$0004,d1.l

jf HDI_en

nop

move.l d15,r15 ; clear watchdog handle counter

move.l #$1,d15; indicate software watchdog enabled

move.l #$0100,r15; initialize watchdog handle counter

;set the HEN bit in hpcr

HDI_en

move.w HPCR,d3

or #$0080,d3.l

move.w d3,HPCR

;get the 8bit bit from hpcr ( which is in d3 )

;if (8bit ) goto load_8bit else goto load_16bit

bmtsts #$0040,d3.l

jt load_8bit

jmp load_16bit

load_last_long_2_16

;if the size left to load is only 2 words ( 4 bytes)

;and the mode is 16-bit so every load action is of 4 words

;in this case the load action already loaded the checksum

;and the ~checksum, so it is a special case which needs handling

;by itself

jsr load_from_fifo

EB632 Datasheet(PDF) 87 Page - Freescale Semiconductor, Inc

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