RedBoot™ User's Guide: Document Version 1.9, February 2003 | ||
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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. Two basic RedBoot configurations are supported:
RedBoot running from RAM which has been relocated from the board's flash boot sector.
RedBoot running from RAM with RedBoot in the flash boot sector.
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.
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.
Since RedBoot for this board relocates itself from ROM to RAM at startup, it is not necessary to run a secondary RAM based version of RedBoot to update the main FLASH image. Instead this can be done from the primary version of RedBoot.
To update the primary RedBoot image, follow the procedures detailed in the Section called Update the primary RedBoot flash image in Chapter 4, but the actual numbers used with the flags in the sample commands should be:
-b 0x80100000 |
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 RedBoot image occupies flash addresses 0x1fc00000 - 0x1fc1ffff. To execute it copies itself out of there to RAM at 0x80000000. RedBoot reserves 1MB of RAM from 0x80000000 to 0x800FFFFF for its own use. The top 1MB of RAM from 0x81F00000 to 0x81FFFFFF is reserved for use by the PCI Ethernet device. RAM based RedBoot configurations are designed to run from RAM at virtual addresses 0x80100000 - 0x8011ffff. RAM virtual addresses from 0x80020000 to the start of the PCI window are available for general use, such as a temporary scratchpad for downloaded images, before they are written to flash.
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.
The instructions in Chapter 3 should be followed. The values for TARGET, ARCH_DIR and PLATFORM_DIR on this platform are “vrc4375”, “mips” and “vrc4375” respectively. The configuration export files supplied in the hal/mips/vrc4375/VERSION/misc directory in the RedBoot source tree should be used. In general only the ROMRAM variant should need to be used.