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The On-board Software
! When the SW2 button is pressed:
– Reserved
! When the SW3 button is pressed:
– All the LEDs light up together.
– The D3 LED remains lit when SW3 is released.
– The Flash uploader is activated.
! When the SW4 button is pressed:
– All the LEDs light up together.
– The D4 LED remains lit when SW4 is released.
– The power-down function is activated.
! When no buttons are pressed:
– Branch at address 0x01006000.
– The Angel Debug Monitor starts from this address by recopying itself in
external SRAM.
3.3
Programmed
Default Memory
Mapping
Table 3-1 defines the mapping defined by the boot program.
Table 3-1. Memory Map
Part Name
U1
Start Address
0x01000000
End Address
0x011FFFFF
Size
2M Bytes
Device
Flash
AT49BV162A
U2 - U3
0x02000000
0x0203FFFF
256K Bytes
SRAM
The Boot Software Program, Functional Test Software (FTS), Flash Uploader and the
power-down demonstration are in sectors 0 and 1 of the Flash device. Sectors 3 to 8
support the Angel Debug Monitor.
Sector 24 at address 0x0110 0000 can be programmed with a user application to be
debugged. This sector is mapped at address 0x0100 0000 (or 0x0 after a reset) when
the jumper JP1 is in the USER position.
3.4
3-2
Flash Uploader
The Flash Uploader included in the EB42 Boot Software is the same Flash Uploader
factory-programmed in the Flash-based AT91 devices, the AT91FR4042 and the
AT91FR40162/S. The Flash Uploader allows programming to Sector 24 of Flash
through a serial port. Either of the on-chip USARTs can be used by the Flash Uploader.
To boot from the application downloaded in Sector 24, the downloading address must
be 0x01100000. The boot starts the Flash Uploader if the SW3 button is pressed at
reset.
The procedure is as follows:
1. Connect the Serial A or B port of the AT91EB42 Evaluation Board to a host PC
Serial port using the straight serial cable provided.
2. Start the AT91Loader.exe program available in the AT91 Library on the host com-
puter. The AT91 Loader must be configured beforehand. See the “Readme.pdf ”
file in folder <CDROM>\ToolBox\host_tools\Dev PC windev\AT91Loader\Doc.
AT91EB42 Evaluation Board User Guide
1708C–ATARM–12-May-05
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