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Booting the Newisys NA-1400

Every computer needs a bootloader. While on normal x86 platforms this is handled by the BIOS on other platforms like ARM/XScale a different bootloader has to be used; in case of the NA-1400 RedBoot is used. This page lists specific information regarding the use of RedBoot on the Newisys NA-1400.


The main responsiblity of the bootloader is to load, unpack and run the Linux kernel. It also provides means to boot from a remote computer (via e.g. a serial port or network connection) and, in case of a corrupted Linux installation, it allowes to update the flash contents.

Online documentation regarding RedBoot can be found here: RedBoot Users Guide.

User interface

Access to Redboot is gained by pressing control-C (^C) in a serial port terminal session when Redboot is about to execute the boot script (which will start the Linux kernel). Below is the boot process ending when commandline access is gained:

***###+DRAM: OK
***###+PIC: OK

***###+FLASH: OK
i82541er_init: RedBoot MAC Address = A0 83 00 00 48 BE
i82541er_init: read from config: ok
Can't get BOOTP info, using default IP address
Ethernet eth0: MAC address 00:09:3d:14:83:5f
IP:, Gateway:
Default server:, DNS server IP:
usb_ohci: Did not find device

***###+SATA: OK

RedBoot(tm) bootstrap and debug environment [ROM]
Intel IOP RedBoot modfied by AppianceWare for Sanmina release
         version 2.1-IOP-RedBoot-ApplianceWare-Sanmina
         built 19:07:50, Dec 14 2005

Platform: Sanmina (XScale)
Copyright (C) 2000, 2001, 2002, Red Hat, Inc.

RAM: 0x00000000-0x10000000, 0x00033168-0x0ffd1000 available
FLASH: 0xf0000000 - 0xf1000000, 128 blocks of 0x00020000 bytes each.
== Executing boot script in 3.000 seconds - enter ^C to abort


Serial port

Startup mode

Resource usage


Below is the layout of the flash disk as seen by Redboot:

RedBoot> fis list
Name              FLASH addr  Mem addr    Length      Entry point
RedBoot           0xF0000000  0xF0000000  0x00040000  0x00000000
RedBoot config    0xF0FC0000  0xF0FC0000  0x00001000  0x00000000
FIS directory     0xF0FE0000  0xF0FE0000  0x00020000  0x00000000
initrd            0xF0040000  0x02000000  0x004E0000  0x02000000
kernel            0xF0520000  0x01008000  0x00180000  0x01008000


doc/redboot_bootstrap_environment.1156275752.txt.gz · Last modified: 2006/08/23 10:47 by admin