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Hi, I am accessing a 21065L via the host port and want to download a program. I wrote my own boot loader (because of several problems) that sets up SYSCON, enables global interrupt, enables interrupt IRQ1, disables the interrupt of the DMA1 (EP1I, the DMA channel I use to download the whole data) and goes into an idle state with the program counter set to the address 0x8004. For the download I set all the necessary IOP registers IIEP1, IMEP1, CEP1 and DMAC1 via the host port. When I download a program written in assembler the download succeeds and with asserting IRQ1 the program runs. The problem occurs when I try to download a program written in C. When I assert IRQ1 after the download, the program doesn't start. Are there any prerequesites necessary to make the C runtime environment running the processor e.g. setting several registers? Thanks in advance ! Bernd |
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Problems at download C programs
Started by ●June 28, 2002
Reply by ●July 2, 20022002-07-02
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On Fri, 2002-06-28 at 09:18, Bernd Pfaff wrote: > The problem occurs when I try to download a program written in C. When I > assert IRQ1 after the download, the program doesn't start. How do you know it doesn't start? Does it start to run the C runtime's startup code? Where does it get hung up? With VDSP and an ICE, disable "run to main" in preferences so you can walk through the startup code. |
