AT91EB55 datasheet(10/37 Pages) ATMEL

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The On-board Software

3-2

AT91EB55 Evaluation Board User Guide

When no buttons are pressed:

Branch at address 0x01004000

The Angel Debug Monitor starts from this address by recopying itself in external

SRAM

3.3

Programmed

Default Memory

Mapping

The following table defines the mapping defined by the boot program.

The Boot Software Program, FTS and SRAM downloader are in sectors 0 and 1 of the

Flash device. Sectors 2 to 7 support the Angel Debug Monitor

Sector 24 at address 0x01100000 must be programmed with a boot sequence to be

debugged. This sector can be mapped at address 0x01000000 (or 0x0 after a reset)

when the jumper JP1 is in the USER position.

3.4

The SRAM

Downloader

The SRAM downloader allows an application to be loaded in the SRAM at the address

0x02000000 and then activates it. The boot starts it if the SW2 button is pressed at

reset.

The procedure is as follows:

Connect the AT91EB55 Evaluation Board to the host PC serial A connection

using the straight serial cable provided.

Power on or press RESET, simultaneously holding down the SW2 button. Wait

for D2 to light up and then release SW2.

Start the BINCOM utility, available in the AT91 Library, on the host computer:

Select the communication port (COM1 or COM2, depending on where the serial

cable is connected to the host PC) and the baud rate for communications (115200

baud, 1 stop bit, no parity), then open the file to be downloaded and send it. Wait for

the transfer to end.

Press any button to end the download. The control is switched to the address

0x02000000.

3.5

The Angel Debug

Monitor

The Angel Debug Monitor is located in the flash from 0x01004000 up to 0x0100FFFF.

The boot program starts it if no button is pressed.

When Angel starts, it recopies itself in SRAM in order to run faster. The SRAM used by

Angel is from 0x02020000 to 0x0203FFFF, i.e., the highest half part of the SRAM.

The Angel on the AT91EB55 can be upgraded regardless of the version programmed on

it.

Note:

If the debugger is started through ICE while the Angel monitor is on, the

Advanced Interrupt Controller (AIC) and the USART channel are enabled.

Table 1. Memory Map

Part Name

Start Address

End Address

Size

Device

0x01000000

0x011FFFFF

2-Mbyte

Flash AT49BV16X4

U2 - U3

0x02000000

0x0203FFFF

256-Kbyte

SRAM

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