On Fri, Jul 11, 2014 at 04:13:47PM +0200, Raphaël Poggi wrote:
> Hi all !
>
> I want to use barebox with nand support (Soft ECC) on a custom board
> based on SAM9M10, but the nand has a 256 oob size and it is not
> supported on barebox.
>
> Barebox fails, because there is no oob scheme defined for 256 size.
>
> if (!chip->ecc.layout && (chip->ecc.mode != NAND_ECC_SOFT_BCH)) {
> switch (mtd->oobsize) {
> case 8:
> chip->ecc.layout = &nand_oob_8;
> break;
> case 16:
> chip->ecc.layout = &nand_oob_16;
> break;
> case 64:
> chip->ecc.layout = &nand_oob_64;
> break;
> case 128:
> chip->ecc.layout = &nand_oob_128;
> break;
> default:
> pr_warn("No oob scheme defined for oobsize %d\n",
> mtd->oobsize);
> BUG();
> }
> }
>
>
> I have found this oob_256 scheme but I don't know if it's correct or not.
>
> static struct nand_ecclayout nand_oob_256 = {
> .eccbytes = 96,
> .eccpos = {
> 160, 161, 162, 163, 164, 165, 166, 167,
> 168, 169, 170, 171, 172, 173, 174, 175,
> 176, 177, 178, 179, 180, 181, 182, 183,
> 184, 185, 186, 187, 188, 189, 190, 191,
> 192, 193, 194, 195, 196, 197, 198, 199,
> 200, 201, 202, 203, 204, 205, 206, 207,
> 208, 209, 210, 211, 212, 213, 214, 215,
> 216, 217, 218, 219, 220, 221, 222, 223,
> 224, 225, 226, 227, 228, 229, 230, 231,
> 232, 233, 234, 235, 236, 237, 238, 239,
> 240, 241, 242, 243, 244, 245, 246, 247,
> 248, 249, 250, 251, 252, 253, 254, 255},
> .oobfree = {
> {.offset = 2,
> .length = 158}}
> };
>
> Can we use this scheme ? Or there is another solution ?
Please grep for nand_bch_init in both the kernel and barebox.
This function automatically constructs a suitable ecc layout
based on the NAND parameters. This code doesn't seem to have users
in barebox, so I don't know whether it works correctly, but
this is the way to go.
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
