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On 1/21/07, Ralf Baechle <ralf@linux-mips.org> wrote: > > The overhead of timer interrupts at this low clockrate is significant > so I recommend to minimize the timer interrupt rate as far as possible. > This is really a tradeoff between latency and overhead and matters > much less on hardcores which run at hundreds of MHz. For power sensitive > applications lowering the interrupt rate can also help. And that's alredy > pretty much what you need to know, that is a 10ms timer is fine. > I have worked with FPGA Linux system which is reconfigurable on-the-fly by the 200Mhz ARM9 CPU running Debian Linux, Altera Cyclone II FPGA is included on my TS-7300 board. Advantage is, Altera FPGA and a dedicated high-speed bus between the CPU and FPGA provides a good design scope to provide many solutions. Coming to boot up (by an USB 1GB SD card), by doing enough software tuning bootup to a Linux prompt takes just 1.69 seconds after power-up. If I remember correctly, SD image will look at the state of jumper 6 (should be put ON), the full Debian bootup will be bypassed and the system will instead drop straight to a shell prompt. 1.69 seconds after power-on the serial console prompt is active and 2.41 seconds after power-on the video console is displayed. This software is based on Debian & has a vendor supplied Linux boot loader. Currently am working (slowly in free time) to bring the whole thing to FC6. Shall post the progres... > > Ralf ~Akula2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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