Comtrol eCos - Manual (Page 255)

Chapter 5. Installation and Testing
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:
Configuration Mode Description File
ROM [ROM] RedBoot running from the
board’s flash boot sector. redboot_ROM.ecm
RAM [RAM] RedBoot running from
RAM with RedBoot in the
flash boot sector. redboot_RAM.ecm
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:
-b < addr>
Location to store command line and environment passed to kernel
-w < time>
Wait time in seconds before starting kernel
-c "params"
Parameters passed to kernel
< addr>
Kernel entry point, defaulting to the entry point of the last image loaded
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.
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