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15 Jun 2008
I recently looked into how the NAND is hooked up on the Zaurus (my C750):
|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.
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.
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