RedBoot supports both serial ports, which are available via the stacked serial connectors on the mother board in the case of the FR400 CPU board, and via serial connectors present on the other supported CPU boards themselves. The topmost port is the default and is considered to be port 0 by RedBoot. The bottommost port is serial port 1. The default serial port settings are 115200,8,N,1. The serial port supports baud rates up to 460800, which can be set using the baud command as described in Chapter 2.
FLASH management is also supported, but only for the FLASH device in IC7. This arrangement allows for IC8 to retain either the original Fujitsu board firmware, or some application specific contents. Two basic RedBoot configurations are supported:
|ROMRAM||[ROMRAM]||RedBoot running from RAM, but contained in the board's flash boot sector.||redboot_ROMRAM.ecm|
|RAM||[RAM]||RedBoot running from RAM with RedBoot in the flash boot sector.||redboot_RAM.ecm|
Since the normal RedBoot configuration does not use the FLASH ROM except during startup, it is unnecessary to load a RAM-based RedBoot before reprogramming the FLASH.
RedBoot can be installed by directly programming the FLASH device in IC7 or by using the Fujitsu provided software to download and install a version into the FLASH device. Complete instructions are provided separately.
The exec command as described in Chapter 2 is supported by RedBoot on this target, for executing Linux kernels. Only the command line and timeout options are relevant to this platform.
The memory map of this platform is fixed by the hardware (cannot be changed by software). The only attributes which can be modified are control over cacheability, as noted below.
Address Cache? Resource 00000000-03EFFFFF Yes SDRAM (via plugin DIMM) 03F00000-03FFFFFF No SDRAM (used for PCI window) 10000000-1FFFFFFF No MB86943 PCI bridge 20000000-201FFFFF No SRAM 21000000-23FFFFFF No Motherboard resources 24000000-25FFFFFF No PCI I/O space 26000000-2FFFFFFF No PCI Memory space 30000000-FDFFFFFF ?? Unused FE000000-FEFFFFFF No I/O devices FF000000-FF1FFFFF No IC7 - RedBoot FLASH FF200000-FF3FFFFF No IC8 - unused FLASH FF400000-FFFFFFFF No Misc other I/O
NOTE: The only configuration currently suppored requires a 64MiB SDRAM DIMM to be present on the CPU card. No other memory configuration is supported at this time.
These shell variables provide the platform-specific information needed for building RedBoot according to the procedure described in Chapter 3:
export TARGET=mb93091 export ARCH_DIR=frv export PLATFORM_DIR=mb93091
The names of configuration files are listed above with the description of the associated modes.
The RedBoot image occupies flash addresses 0xFF000000 - 0xFF03FFFF. To execute it copies itself out of there to RAM at 0x03E00000. RedBoot reserves memory from 0x00000000 to 0x0001FFFF for its own use. User programs can use memory from 0x00020000 to 0x03DFFFFF. RAM based RedBoot configurations are designed to run from RAM at 0x00020000.