Multiprocessor Link Port Booting - Analog Devices ADSP-TS101 TigerSHARC Hardware Reference Manual

DMA Operation on Boot
If host booting from the external port and external memory is present in
the system which requires initialization at boot time, the host interface
should de-assert
processor to gain access to the bus in order to initialize external memory.
!
The
SYSCON
memory is to be initialized. These registers can be modified only
once after reset, and the user may need to modify these register set-
tings in the boot loader kernel depending on system requirements.

Multiprocessor Link Port Booting

In systems where multiple processors are not connected by the parallel
external bus, booting can be accomplished from a single source through
the link ports. If only a daisy chain connection exists between the proces-
sors' link ports, then each TigerSHARC processor can boot the next one
in turn. Any link port can be used for booting.
In link boot mode, an TigerSHARC processor that is already booted
writes to any link port of another TigerSHARC processor. This is sequen-
tial booting.
DMA Operation on Boot
Booting refers to the way the processor downloads programs to the inter-
nal memory of a TigerSHARC processor after power up. For example,
when the TigerSHARC processor boots from an external EPROM, the
DMA controller requests data transfers from external EPROM to internal
memory, and a complete block is transferred. DMA, by default, moves
only 256 words to internal memory (locations 0x00000000-0x000000ff)
that comprise the boot loader (supplied with TigerSHARC processor
tools). The boot loader, in turn, loads the remaining user code.
10-32
between word transfers to allow the TigerSHARC
HBR
and registers must be modified if external
SDRCON
ADSP-TS101 TigerSHARC Processor
Hardware Reference