[U-Boot] ACER n310 NAND write protection issue
fcipaq
daniel.kammer at web.de
Thu May 12 09:48:26 CEST 2011
Figured out myself. If anyone has the same issue:
set bit 12 of port A to 1:
GPADAT |= (1 << 11)
fcipaq wrote:
>
> Hey everyone,
>
> I've got an ACER n310 (n300 series). It features a s3c2440 running at 300
> MHz, 64 MB SDRAM and 128 MB NAND ROM (it's Samsung k9f1g08). It's not
> equipped with any NOR-Flash. Apart from that it's got quite a similar
> configuration as FriendlyARM's Mini2440.
> I downloaded the sources of u-boot and configured it according to my PDA's
> hardware. So far, u-boot is running and I'm able to read the whole
> NAND-Flash. But when I'm trying to unlock the NAND-Flash, I get the
> following error message:
>
> n310 # nand unlock
>
> device 0 whole chip
>
> nand_unlock: start: 00000000, length: 134217728!
>
> nand_unlock: Device is write protected!
>
> Error unlocking NAND flash, write and erase will probably fail
>
> What I conclude from that is: the (NOT)WP-Pin is set to ground. The
> Mini2440 is not effected by this kind of issue as (according to the
> schematics) the (NOT)WP-Pin is connected to VCC.
> However there must be a way to toggle this pin, as the original
> ACER-bootloader and WM5 respectively are able to write to the flash.
> Any ideas how to cancel the write protection or how to figure out what pin
> is connected to WP (schematics are not available)?
> Thanks in advance and best regards
>
> Daniel
>
--
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