Datasheet

SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
102
12.6 NAND Flash Boot
The NAND Flash Boot program searches for a valid application in the NAND Flash memory. The first block must
be guaranteed by the manufacturer. There is no ECC check. If a valid application is found, this application is
loaded into internal SRAM and executed by branching at address 0x0000_0000 after remap. See “DataFlash
Boot” on page 99 for more information on Valid Image Detection.
12.6.1 Supported NAND Flash Devices
Any 8-bit or 16-bit NAND Flash device connected on EBI0 is supported.
12.7 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:
 Check if USB Device enumeration has occurred.
 Check if character(s) have been received on the DBGU.
 Once the communication interface is identified, the application runs in an infinite loop waiting for
different commands as in Table 12-3.
 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.
Table 12-3. 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#