MIPS/RM7000 PMC-Sierra Ocelot

Overview

RedBoot uses the front facing serial port. The default serial port settings are 38400,8,N,1. RedBoot also supports ethernet. Management of onboard flash is also supported.

The following RedBoot configurations are supported:

Additional commands

The exec command which allows the loading and execution of Linux kernels, is supported for this architecture (see the Section called Executing Programs from RedBoot in Chapter 2). The exec parameters used for MIPS boards are:

Linux kernels on MIPS platforms expect the entry point to be called with arguments in the registers equivalent to a C call with prototype:

void Linux(int argc, char **argv, char **envp);

RedBoot will place the appropriate data at the offset specified by the -b parameter, or by default at address 0x80080000, and will set the arguments accordingly when calling into the kernel.

The default entry point, if no image with explicit entry point has been loaded and none is specified, is 0x80000750.

Memory Maps

RedBoot sets up the following memory map on the Ocelot board.

Note that these addresses are accessed through kseg0/1 and thus translate to the actual address range 0x80000000-0xbfffffff, depending on the need for caching/non-caching access to the bus.

Physical Address Range Description
----------------------- -----------
0x00000000 - 0x0fffffff SDRAM
0x10000000 - 0x10ffffff PCI I/O space
0x12000000 - 0x13ffffff PCI Memory space
0x14000000 - 0x1400ffff Galileo system controller
0x1c000000 - 0x1c0000ff PLD (board logic)
0x1fc00000 - 0x1fc7ffff flash

Rebuilding RedBoot

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

export TARGET=ocelot
export ARCH_DIR=mips
export PLATFORM_DIR=rm7000/ocelot

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