ARM/StrongARM(SA110) Intel EBSA 285


RedBoot uses the single EBSA-285 serial port. The default serial port settings are 38400,8,N,1. If the EBSA-285 is used as a host on a PCI backplane, ethernet is supported using an Intel PRO/100+ ethernet adapter. Management of onboard flash is also supported.

The following RedBoot configurations are supported:

ROM[ROM]RedBoot running from the board's flash boot sector.redboot_ROM.ecm
RAM[RAM]RedBoot running from RAM with RedBoot in the flash boot sector.redboot_RAM.ecm

Initial Installation Method

A linux application is used to program the flash over the PCI bus. Sources and build instructions for this utility are located in the RedBoot sources in: packages/hal/arm/ebsa285/current/support/linux/safl_util

Communication Channels

Serial, Intel PRO 10/100+ 82559 PCI ethernet card.

Special RedBoot Commands


Memory Maps

Physical and virtual mapping are mapped one to one on the EBSA-285 using a first level page table located at address 0x4000. No second level tables are used.

NOTE: The virtual memory maps in this section use a C and B column to indicate whether or not the region is cached (C) or buffered (B).

Address Range            C B  Description
-----------------------  - -  ----------------------------------
0x00000000 - 0x01ffffff  Y Y  SDRAM
0x40000000 - 0x400fffff  N N  21285 Registers
0x41000000 - 0x413fffff  Y N  flash
0x42000000 - 0x420fffff  N N  21285 CSR Space
0x50000000 - 0x50ffffff  Y Y  Cache Clean
0x78000000 - 0x78ffffff  N N  Outbound Write Flush
0x79000000 - 0x7c0fffff  N N  PCI IACK/Config/IO
0x80000000 - 0xffffffff  N Y  PCI Memory 

Platform Resource Usage

Timer3 is used as a polled timer to provide timeout support for networking and XModem file transfers.

Rebuilding RedBoot

These shell variables provide the platform-specific information needed for building RedBoot according to the procedure described in Chapter 3:

export TARGET=ebsa285
export ARCH_DIR=arm
export PLATFORM_DIR=ebsa285

The names of configuration files are listed above with the description of the associated modes.