Motorola PPC/PMC-8260/DS1, Справочное руководство, Страница: 83 / 150

Firmware Loading Application Software
PPC/PMC-8260/DS1 4 - 19
Basic Command
Programming
Procedure Program all commands according to the following instruction.
1. Set necessary command parameters (see Table 14 “Primary Booter Com-
mands and Parameters” page 4-18)
2. Issue command by writing it to SYNC word
3. Poll SYNC word to obtain information on command execution status
For possible return codes, see the “Return Codes” section on page 4-19.
Return Codes
Possible return codes written by the firmware into the SYNC word are:
• BUSY
Operation is ongoing.
• .OK.
Command has been completed successfully.
• !ERR
Error occurred. The ADRS field might give further error information. A value
other than 0 can be interpreted as offset relative to the beginning of the CSR
section where a zero-terminated error string is stored.
• <Written SYNC word>
Primary booter either does not support the command or some error prevents the
read Copies bytes set by parameter <CSIZ>
from memory window offset set by
parameter <COFF>. COFF: Address of I/O buffer (offset
must be used relative to 01C00000
16
)
CWID: Source access width (must be
0)
CADR: Source address
CSIZ: Number of bytes to be trans-
ferred
CSPC: Destination address space
(must be 0)
writ Copies bytes set by <CSIZ> from local
address <CADR> to memory window
offset <COFF>. COFF: Address of I/O buffer (offset
must be used relative to 01C00000
16
)
CWID: Destination access width
(must be 0)
CADR: Destination address
CSIZ: Number of bytes to be trans-
ferred
CSPC: Destination address space
(must be 0)
Table 14: Primary Booter Commands and Parameters (cont.)
Command Description Necessary Parameters