read NAND (my thinking)
xiangfu
xiangfu at openmoko.org
Tue Jul 1 11:21:50 CEST 2008
I read the datesheet and
read the code uboot/cpu/arm920t/s3c24x0/nand_read.c
and there is some function may be we can use ,i am not sure.
like:
/* low level nand read function */
int nand_read_ll(unsigned char *buf, unsigned long start_addr, int size)
{
int i, j;
if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK))
return -1; /* invalid alignment */
/* chip Enable */
nand_select();
nand_clear_RnB();
for (i=0; i<10; i++);
for (i=start_addr; i < (start_addr + size);) {
j = nand_read_page_ll(buf, i);
i += j;
buf += j;
}
/* chip Disable */
nand_deselect();
return 0;
}
my thinking is:
1. store a LED_ON image in NAND flash
2. use the OPENOCD read the another LED_ON to the ROM.
3. and run the ROM LED_ON , it will read the NAND flash and load
the (1)LED_ON
there is some question,
1. how can i store a file in NAND like LED_ON ? use the dfu-util ?
like werner tell me before.
2. the file must have a size like 1020byte. read the NAND must page
by page ,
is there must spare in the NAND?
3. may be i can read the file from NAND to the BUF ,how can i make
the CPU run this code.
THANKS
a beginner
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