[avr-gcc-list] optimization flags causes problems??

[Ramazan Kerek]

Hello,
I have started using AT90CAN128 with WinAVR-20080402.
I am having problem with with optimizatin flags.

1- When I use the following code along with "-O1, -O2,-O3, -O4, -Os "
and whenI debug it, I do not see any change in PORTA. But when I built
it with -O0, I see the changes in PORTA as I expected.
DDRA=0xFF;
for(i=0;i<8;i++)
{
        PORTA=0x01;
        PORTA=0x02;
        PORTA=0x04;
        PORTA=0x08;
        PORTA=0x10;
        PORTA=0x20;
        PORTA=0x40;
        PORTA=0x80;

}

2-I am using EEPROM_Write/Read functions in my project.   When I compile
the project with -O0 option, and start dtata transfer to EEPROM memory,
I do not see any transfer to EEPROM memory. With other optimization
options, I can transfer it.
See the functions below
void EEPROM_write (unsigned int uiAddress, unsigned char *ucWrData,
unsigned int uiBufSize)
{
        volatile unsigned int i=0;
asm("cli");
        for(i=0;i<uiBufSize;i++)
        {
                /* Wait for completion of previous write */
                while(EECR & (1<<EEWE));
                while(SPMCSR & (1<<SPMEN));
                /* Set up address and data registers */
                EEAR = uiAddress++;
                EEDR = *(ucWrData++);
                /* Write logical one to EEMWE */
                EECR |= (1<<EEMWE);
                /* Start eeprom write by setting EEWE */
                EECR |= (1<<EEWE);
        }
        EECR=0x00;
asm("sei");     
}


void EEPROM_read(unsigned int uiAddress, unsigned char
*ucRdData,unsigned char ucRdDataSize)
{
        volatile unsigned int i=0;
asm("cli");
        for(i=0;i<ucRdDataSize;i++)
        {
                /* Wait for completion of previous write */
                while(EECR & (1<<EEWE));
                while(SPMCSR & (1<<SPMEN));
                /* Set up address register */
                EEAR = uiAddress++;
                /* Start eeprom read by writing EERE */
                EECR |= (1<<EERE);
                /* Return data from data register */
                *(ucRdData++)=EEDR;

        }
        EECR=0x00;
asm("sei");     
}


COULD YOU PLEASE TELL ME IF ANYONE IS HAVING SIMILAR PROBLEMS?
IF SO, IS THERE ANY SOLUTION FOR THIS.

Best Regards

R. Kerek