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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
60 of 1441
NXP Semiconductors
UM10503
Chapter 5: LPC43xx Boot ROM
5.3.4 Boot modes
5.3.4.1 UART boot mode
details the boot-flow steps of the UART boot mode. The execution of this mode
occurs only if the boot mode is set accordingly (see boot modes
).
As illustrated in
, configure the UART with the following settings:
•
Baudrate = 115200, 57600, 38400, 19200, or 9600
•
Data bits = 8
•
Parity = None
•
Stop bits = 1
Auto baud is active; boot waits until 0x3F is received and responds with “OK”. This should
be followed by the header and image. The boot ROM doesn't implement any flow control
or any handshake mechanisms during file transfer.
After the boot image is downloaded, it is checked (based on header information) to be a
valid or invalid image and OK respectively FAILED is sent to a host followed by CR and
LF. Finally, the full boot image is copied, processed to address 0x10000000 and executed
from there.