help me about cfi

hello rugbybloke,

firstly,i set a break point at alt_flash_cfi_init( alt_flash_cfi_dev* flash ) in altera_avalon_cfi_flash .c

then execute : alt_read_cfi_width( flash ); i step into the function.

then execut : alt_write_flash_command_8bit(flash->dev.base_addr, 0x55, QUERY_MODE); i can't trace at this sentence : IOWR_8DIRECT(base_addr, offset, value);

int alt_read_cfi_width(alt_flash_cfi_dev* flash)

{

int i;

alt_u8 byte_id[12];

alt_u8 byte_iface;

alt_u16 half_word_iface;

alt_u32 full_word_iface;

int ret_code = 0;

alt_write_flash_command_8bit(flash->dev.base_addr, 0x55, QUERY_MODE);

for(i=0;i<3;i++)

{

byte_id = iord_8direct(flash->dev.base_addr, 0x10+i);

}

if ((byte_id[0] == &#39;q&#39;) &&

(byte_id[1] == &#39;r&#39;) &&

(byte_id[2] == &#39;y&#39;))

{

flash->native_word_size = 1;

byte_iface = iord_8direct(flash->dev.base_addr, 0x28);

byte_iface += 1;

if (!(byte_iface & 0x1))

{

ret_code = -enodev;

}

}

else

{

/*

* put the device back into read array mode

*

* not strictly necessary i think

*/

alt_write_flash_command_8bit(flash->dev.base_addr, 0x55, read_array_mode);

/*

* try to put the device into query mode

*/

alt_write_flash_command_16bit(flash->dev.base_addr, 0x55, query_mode);

for(i=0;i<6;i++)

{

byte_id = IORD_8DIRECT(flash->dev.base_addr, 0x20+i);

}

if ((byte_id[0] == &#39;Q&#39;) &&

(byte_id[1] == &#39;\0&#39;) &&

(byte_id[2] == &#39;R&#39;) &&

(byte_id[3] == &#39;\0&#39;) &&

(byte_id[4] == &#39;Y&#39;) &&

(byte_id[5] == &#39;\0&#39;))

{

flash->native_word_size = 2;

half_word_iface = IORD_16DIRECT(flash->dev.base_addr, 0x28*2);

half_word_iface += 1;

if (!(half_word_iface & 0x2))

{

ret_code = -ENODEV;

}

}

else if ((byte_id[0] == &#39;Q&#39;) &&

(byte_id[1] == &#39;Q&#39;) &&

(byte_id[2] == &#39;R&#39;) &&

(byte_id[3] == &#39;R&#39;) &&

(byte_id[4] == &#39;Y&#39;) &&

(byte_id[5] == &#39;Y&#39;))

{

flash->native_word_size = 2;

half_word_iface = IORD_16DIRECT(flash->dev.base_addr, 0x28*2);

half_word_iface += 1;

if (!(half_word_iface & 0x2))

{

ret_code = -ENODEV;

}

}

else

{

/*

* Put the device back into Read Array Mode

*/

alt_write_flash_command_16bit(flash->dev.base_addr, 0x55, READ_ARRAY_MODE);

/*

* Try to put the device into Query mode

*/

alt_write_flash_command_32bit(flash->dev.base_addr, 0x55, QUERY_MODE);

for(i=0;i<12;i++)

{

byte_id[i] = IORD_8DIRECT(flash->dev.base_addr, 0x40+i);

}

if ((byte_id[0] == &#39;Q&#39;) &&

(byte_id[1] == &#39;\0&#39;) &&

(byte_id[2] == &#39;\0&#39;) &&

(byte_id[3] == &#39;\0&#39;) &&

(byte_id[4] == &#39;R&#39;) &&

(byte_id[5] == &#39;\0&#39;) &&

(byte_id[6] == &#39;\0&#39;) &&

(byte_id[7] == &#39;\0&#39;) &&

(byte_id[8] == &#39;Y&#39;) &&

(byte_id[9] == &#39;\0&#39;) &&

(byte_id[10] == &#39;\0&#39;) &&

(byte_id[11] == &#39;\0&#39;))

{

flash->native_word_size = 4;

full_word_iface = IORD_32DIRECT(flash->dev.base_addr, 0x28*4);

full_word_iface += 1;

if (!(full_word_iface & 0x4))

{

ret_code = -ENODEV;

}

}

else if ((byte_id[0] == &#39;Q&#39;) &&

(byte_id[1] == &#39;\0&#39;) &&

(byte_id[2] == &#39;Q&#39;) &&

(byte_id[3] == &#39;\0&#39;) &&

(byte_id[4] == &#39;R&#39;) &&

(byte_id[5] == &#39;\0&#39;) &&

(byte_id[6] == &#39;R&#39;) &&

(byte_id[7] == &#39;\0&#39;) &&

(byte_id[8] == &#39;Y&#39;) &&

(byte_id[9] == &#39;\0&#39;) &&

(byte_id[10] == &#39;Y&#39;) &&

(byte_id[11] == &#39;\0&#39;))

{

flash->native_word_size = 2;

full_word_iface = IORD_32DIRECT(flash->dev.base_addr, 0x28*4);

full_word_iface += 1;

if (!(full_word_iface & 0x4))

{

ret_code = -ENODEV;

}

}

else if ((byte_id[0] == &#39;Q&#39;) &&

(byte_id[1] == &#39;Q&#39;) &&

(byte_id[2] == &#39;Q&#39;) &&

(byte_id[3] == &#39;Q&#39;) &&

(byte_id[4] == &#39;R&#39;) &&

(byte_id[5] == &#39;R&#39;) &&

(byte_id[6] == &#39;R&#39;) &&

(byte_id[7] == &#39;R&#39;) &&

(byte_id[8] == &#39;Y&#39;) &&

(byte_id[9] == &#39;Y&#39;) &&

(byte_id[10] == &#39;Y&#39;) &&

(byte_id[11] == &#39;Y&#39;))

{

flash->native_word_size = 1;

full_word_iface = IORD_32DIRECT(flash->dev.base_addr, 0x28*4);

full_word_iface += 1;

if (!(full_word_iface & 0x4))

{

ret_code = -ENODEV;

}

}

else

{

ret_code = -enodev;// the ret_code get -19 at this place

}

/*

* Put the device back into Read Array Mode

*/

alt_write_flash_command_32bit(flash->dev.base_addr, 0x55, READ_ARRAY_MODE);

}

}

return ret_code;

}