RedBoot supports only serial port 1, which is connected to the upper of the stacked serial connectors on the board. The default serial port settings are 38400,8,N,1. FLASH management is also supported.
The following RedBoot configurations are supported:
A device programmer should be used to program a socketed FLASH part (AMD 29F040). The board as delivered is configured for a 512K EPROM. To install a FLASH ROM, Jumpers J30, J31 and J36 need to be changed as described in the board's User Manual.
RedBoot sets up the memory map primarily as described in the board's User Manual. There are some minor differences, noted in the following table:
Physical Virtual Resource Addresses Addresses 00000000-01FFFFFF 80000000-81FFFFFF Base SDRAM (cached) 00000000-01FFFFFF A0000000-A1FFFFFF Base SDRAM (uncached) 0C000000-0C0BFFFF AC000000-AC0B0000 PCI IO space 0F000000-0F0001FF AF000000-AF0001FF VRC4375 Registers 1C000000-1C0FFFFF BC000000-BC0FFFFF VRC4372 Registers 1C100000-1DFFFFFF BC100000-BDFFFFFF PCI Memory space 1FC00000-1FC7FFFF BFC00000-BFC7FFFF FLASH ROM 80000000-8000000D C0000000-C000000D RTC 8000000E-80007FFF C000000E-C0007FFF NVRAM 81000000-81FFFFFF C1000000-C1FFFFFF Z85C30 DUART 82000000-82FFFFFF C2000000-C2FFFFFF Z8536 Timer 83000000-83FFFFFF C3000000-C3FFFFFF 8255 Parallel port 87000000-87FFFFFF C7000000-C7FFFFFF Seven segment display
NOTE: By default the VRC4375 SIMM control registers are not programmed since the values used must depend on the SIMMs installed. If SIMMs are to be used, correct values must be placed in these registers before accessing the SIMM address range.
NOTE: The allocation of address ranges to devices in the PCI IO and memory spaces is handled by the eCos PCI support library. They do not correspond to those described in the board User Manual.
NOTE: The MMU has been set up to relocate the VRC4372 supported devices mapped at physical addresses 0x8xxxxxxx to virtual addresses 0xCxxxxxxx.
The ethernet driver is in two parts:
A generic ether driver for the Intel i21143 device is located in devs/eth/intel/i21143. Its package name is CYGPKG_DEVS_ETH_INTEL_I21143.
The platform-specific ether driver is devs/eth/mips/vrc4375. Its package is CYGPKG_DEVS_ETH_MIPS_VRC4375. This tells the generic driver the address in IO memory of the chip, for example, and other configuration details. The ESA (MAC address) is by default collected from on-board serial EEPROM, unless configured statically within this package.
These shell variables provide the platform-specific information needed for building RedBoot according to the procedure described in Chapter 3:
export TARGET=vrc4373 export ARCH_DIR=mips export PLATFORM_DIR=vrc4373
The names of configuration files are listed above with the description of the associated modes.