OESF | ELSI | pdaXrom | OpenZaurus | Zaurus Themes | Community Links | Ibiblio


Welcome Guest ( Log In | Register )

Personal Photo
Personal Statement
ranma doesn't have a personal statement currently.
Personal Info
Age Unknown
Gender Not Set
Location Unknown
Birthday Unknown
No Information
Joined: 13-October 07
Profile Views: 499*
Last Seen: 5th July 2009 - 09:17 AM
Local Time: Oct 28 2016, 10:19 AM
5 posts (0 per day)
Contact Information
AIM No Information
Yahoo No Information
ICQ No Information
MSN No Information
* Profile views updated each hour



My Content
15 Jun 2008
Hi all!

I recently looked into how the NAND is hooked up on the Zaurus (my C750):

---------   TP3
|Xilinx | TP2
|CPLD   |   TP1
|       |

TP1 => CE0
TP2 => CE1! (unused?)
TP3 => /WP
TP4 => /WE
TP5 => ALE
TP6 => CLE

I also found two nicely compatible 8GBit TSOP48 Toshiba Flash Chips in a CNMemory 2GByte CF Card.

So I soldered one of the 8GBit chips on top of the already existing 512MBit chip (all signals except CE are shared).
Soldering was a bitch though (pins did almost, but not quite reach the pins below), but with lots of solder, cursing, solderwick and patience
I eventually had all relevant pins connected. smile.gif
Since the Linux kernel unfortunately always enables/disables both CE signals I couldn't simply use the CE1 signal from the CPLD, but for now
(first tests) I hooked up CE to the Cathode of the Green EMail-LED (which is normally always off and the transistor acts as an inverter, so
'on' == low, exactly what I need) and a 10k pull-up.

The system boots fine and a hacked up 'fiddle with CEs and read IDs' kernel module finds both Chips just fine:
Trying to read id from Flash on CE0
Got maker=98 device=76
Trying to read id from Flash on CE1|GreenLED
Got maker=98 device=d3

According to drivers/mtd/nand/nand_ids.c maker 0x98 is 'Toshiba', device 0x76 is a 'NAND 64MiB 3,3V 8-bit' and
device 0xd3 is the shiny new 'NAND 1GiB 3,3V 8-bit' (Yay!).

This should actually already exercise all control signals, so the only remaining task is to modify the built-in sharp_sl nand driver to properly support two chips. smile.gif
Last Visitors
ranma has no visitors to display.

Other users have left no comments for ranma.

There are no friends to display.
RSS Lo-Fi Version Time is now: 28th October 2016 - 10:19 AM