[E3-hacking] PBL and flash access on the E3

en4rab en4rab at yahoo.com
Wed Mar 29 15:26:52 BST 2006

--- David Given <dg at cowlark.com> wrote:

> Thanks to Cliff for the detailed explanation of how the flash metadata
> works. From that, it seems to me that the view of the flash that PBL
> sees (after bad-block remapping) is *not* the same as the view that
> Linux sees (talking directly to the chip). Which means that while I'm
> safe and won't be able to trash the metadata using PBL, I *will* be
> able
> to trash the metadata using Linux --- and if I trash the metadata, I
> won't be able to use PBL to boot from the flash.
> Could the strange issues at the end of the flash be this metadata?

I dont know if it will be of any help but I found a copy of the toshiba
data sheet for that nand device and put it on my website for download
The metadata (crc's for ECC and other stuff) is stored at the end of
eack page.
A page is 528 bytes, 512 bytes are for user data and 16 bytes for ECC or
other metadata.
There is a small note at the end of the datasheet (page32) about
checking for bad pages on a new chip.

|     .-.   en4rab at yahoo.com
|    /   \         .-.
|   /     \       /   \       .-.     .-.     _   _
| /         \   /       \   /     '-'     '-'
|/           '-'         '-'  -END OF TRANSMISSION-

Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 

More information about the e3-hacking mailing list