Ethernet performance using TSE in uClinux

Hi,

--- Quote Start ---

The other problem I'm having trying to implement this is that the SSRAM seems to be used for something already. There is data there, and if I try to write to it, whether it's the buffer or running a program that uses code with its text section there (I tried modifying vmlinux.lds.S), the system freezes. As far as I can tell the hardware doesn't use the SSRAM for anything and I haven't previously modified uClinux to use it in any way.

--- Quote End ---

I forgot to mention this. Where did you locate the exception hook codes? In the file '/home/***/nios2-linux/linux-2.6/arch/nios2/kernel/head.S',

    /* This is the default location for the exception 
     * handler. Code in jump to our handler
     */
exc_hook:    
    movia    r24,inthandler
    jmp    r24
1:        
    /*
     * After flushing the instruction cache, we must flush the data
     * cache.
     */
    movia    r1,NIOS2_DCACHE_SIZE
    movi    r2,NIOS2_DCACHE_LINE_SIZE
data_flush:
    flushd    0(r1)
    sub    r1,r1,r2
    bgt    r1,r0,data_flush
# ifdef CONFIG_BREAK_ON_START
    break# endif //CONFIG_BREAK_ON_START
# if defined(CPU_EXCEPT_ADDRESS_ASM) && (CPU_EXCEPT_ADDRESS_ASM != (LINUX_SDRAM_START + 0x20))
/*    Copy an instruction sequence to put at the exception address */    
        movia    r2,exc_hook
        movia    r3,CPU_EXCEPT_ADDRESS_ASM
        ldw     r1,0(r2)
        stw     r1,0(r3)
        ldw     r1,4(r2)
        stw     r1,4(r3)
        ldw     r1,8(r2)
        stw     r1,8(r3)
        flushd  0(r3)
        flushd  4(r3)
        flushd  8(r3)
        flushi  r3
        addi    r3,r3,4
        flushi  r3
        addi    r3,r3,4
        flushi  r3# endif

the code 'exc_hook' is copied to the new location.

Kazu