RM0046 Boot Assist Module (BAM)
Doc ID 16912 Rev 5 811/936
Then the device executes this startup code. A user application should have a valid
instruction at the reset boot vector address.
If a valid RCHW is not found, the BAM code is executed. In this case BAM moves the
SPC560P40/34 into static mode.
Boot and alternate boot
Some applications require an alternate boot sector in the flash so that the main sector in
flash can be erased and reprogrammed in the field.
When an alternate boot is needed, the user can create two bootable sectors. The low sector
is the main boot sector and the high sector is the alternate boot sector. The alternate boot
sector does not need to be consecutive to the main boot sector.
This ensures that even if one boot sector is erased still there will always be another active
boot sector:
â—Ź Sector shall be activated (i.e., program a valid BOOT_ID instead of 0xFF as initially
programmed).
â—Ź Sector shall be deactivated writing to 0 some of the bits BOOT_ID bit field (bit1 and/or
bit3, and/or bit4, and/or bit6).
33.5.5 Boot through BAM
Executing BAM
Single chip boot mode is managed by hardware and BAM does not participate in it.
BAM is executed only on these two following cases:
â—Ź Serial boot mode has been selected by FAB pin
â—Ź Hardware has not found a valid Boot-ID in any Flash boot locations
If one of these conditions is true, the device fetches code at location 0xFFFF_C000 and
BAM application starts.
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