On Fri, 2015-05-15 at 14:48 -0700, Andrei Yakimov wrote:
Hi, I just found, if NAND ONFI parameter page first copy is bad, u-boot will never read extra copes:
fsl_elbc_nand.c: 342 out_be32(&lbc->fbcr, 256); 343 ctrl->read_bytes = 256;
this code cause "read beyond buffer" error message:
nand_base.c: chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1); 3243 for (i = 0; i < 3; i++) { 3244 for (j = 0; j < sizeof(*p); j++) 3245 ((uint8_t *)p)[j] = chip->read_byte(mtd); 3246 if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) == 3247 le16_to_cpu(p->crc)) { 3248 break; 3249 } 3250 }
Unfortunately I do not working with latest u-boot now, so can not provide a patch, read size should be increased to at least 768 ( 3 copy mandatory for ONFI spec). Linux kernel should be updated too.
Could you send a patch (both here and Linux)? Especially since you have a test case. :-)
Though a better fix than just increasing the byte count would be to add a read_id() callback so that the NAND subsystem can actually tell the driver how much data it's expecting, rather than forcing it to go through cmdfunc that makes high-level drivers (poorly) emulate low-level hardware.
I am also not expert for other NAND controllers drivers.
At least IFC will have the same issue.
-Scott