Datasheet

83
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
12.10 SAM-BA Boot
If no valid DataFlash device has been found during the DataFlash boot sequence, the SAM-BA boot program is
performed.
The SAM-BA boot principle is to:
 Wait for USB Device enumeration.
 In parallel, wait for character(s) received on the DBGU
 Once the communication interface is identified, the application runs in an infinite loop waiting for
different commands as in Table 12-2.
 Write commands: Write a byte (O), a halfword (H) or a word (W) to the target.
 Address: Address in hexadecimal.
 Value: Byte, halfword or word to write in hexadecimal.
 Output: ‘>’.
 Read commands: Read a byte (o), a halfword (h) or a word (w) from the target.
 Address: Address in hexadecimal
 Output: The byte, halfword or word read in hexadecimal following by ‘>’
 Send a file (S): Send a file to a specified address
 Address: Address in hexadecimal
 Output: ‘>’.
Note: There is a time-out on this command which is reached when the prompt ‘>’ appears before the end of the command
execution.
 Receive a file (R): Receive data into a file from a specified address
 Address: Address in hexadecimal

NbOfBytes: Number of bytes in hexadecimal to receive
 Output: ‘>’
 Go (G): Jump to a specified address and execute the code
 Address: Address to jump in hexadecimal
 Output: ‘>’
 Get Version (V): Return the SAM-BA boot version
 Output: ‘>’
Table 12-2. Commands Available through the SAM-BA Boot
Command Action Argument(s) Example
O write a byte Address, Value# O200001,CA#
o read a byte Address,# o200001,#
H write a half word Address, Value# H200002,CAFE#
h read a half word Address,# h200002,#
W write a word Address, Value# W200000,CAFEDECA#
w read a word Address,# w200000,#
S send a file Address,# S200000,#
R receive a file Address, NbOfBytes# R200000,1234#
G go Address# G200200#
V display version No argument V#