[En-Nut-Discussion] Port to a non ethernut board

[Thiago A. Corrêa]

Hi,
   atmega128? I was in a similar situation when I first started out
messing with ethernut, actually I had a lockup exactly where you
describe. The problem were fuse bits if I recall it correctly, or one
of the chip pins were not soldered correctly, not sure. Might be worth
to check those out.

Cheers,
   Thiago A. Corrêa


On 8/24/06, Marc Giger <gigerstyle at gmx.ch> wrote:
> Hello all,
>
> I'm trying to "port" Nut/Os to a non ethernet board, but don't get
> it running.
>
> I spend some time reading the source code and the resulting assembler
> code and still don't see why it doesnt work.
>
> The board in question has the following configuration:
> - atmega128 running with an external 16Mhz crystal
> - 32k extended RAM
> - and and and....
>
> I have built NutOs with the following config:
> PLATFORM = "ETHERNUT1"
> AVR_GCC = ""
> MCU_ATMEGA128 = ""
> NUTMEM_START = "0x100"
> NUTMEM_RESERVED = "64"
> NUTXMEM_SIZE = "28416"
> NUTXMEM_START = "0x1100"
> NUT_CPU_FREQ = "16000000"
> STDIO_FLOATING_POINT = ""
>
> The debugging possibilities are limited because of my
> proprietary programmer, precisely it is limited to switch an onboard
> LED on/off :-/
>
> The LED is attached to PORTE6 which i try to activate directly after
> the extended RAM activation in NutInitXRAM(). So it seems the mcu never
> reaches that (early) point.
>
> The disassembled elf file part:
>
> Disassembly of section .text:
>
> 00000000 <__vectors>:
>        0:       0c 94 46 00     jmp     0x8c <NutInitXRAM>
>        4:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>        8:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>        c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       10:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       14:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       18:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       1c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       20:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       24:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       28:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       2c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       30:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       34:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       38:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       3c:       0c 94 49 07     jmp     0xe92 <__vector_15>
>       40:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       44:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       48:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       4c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       50:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       54:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       58:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       5c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       60:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       64:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       68:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       6c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       70:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       74:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       78:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       7c:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       80:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       84:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>       88:       0c 94 9a 00     jmp     0x134 <__bad_interrupt>
>
> 0000008c <NutInitXRAM>:
>       8c:       80 ec           ldi     r24, 0xC0       ; 192
>       8e:       85 bf           out     0x35, r24       ; 53 <--MCUCR
>       90:       16 9a           sbi     0x02, 6 ; 2     <--DDRE OUT
>       92:       1e 9a           sbi     0x03, 6 ; 3     <--LED ON
>
> 00000094 <NutCustomInit>:
>       94:       87 e0           ldi     r24, 0x07       ; 7
>       96:       89 b9           out     0x09, r24       ; 9
>       98:       80 93 99 00     sts     0x0099, r24
>       9c:       11 24           eor     r1, r1
>       9e:       1f be           out     0x3f, r1        ; 63
>       a0:       cf ef           ldi     r28, 0xFF       ; 255
>       a2:       d0 e1           ldi     r29, 0x10       ; 16
>       a4:       de bf           out     0x3e, r29       ; 62
>       a6:       cd bf           out     0x3d, r28       ; 61
>
> Perhaps somebody knows whats going on and is willing to share
> his/her knowledge with me?
>
> The only difference to my program is that i don't set the SRW10 bit in
> MCUCR, but that shouldn't matter because no SRL bits are set...
>
> Any help is very much appreciated!
>
> Thank you
>
> Marc
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