set bootargs nousb root=/dev/mmcblk0p2 vmalloc=56MB psplash=false mtdparts=nand:0x10000000@0(All)ro console=ttyS2,38400n8

The flash chip in the iPAQ 21x is a samsung_k9f2g08UXA.

256MB total normal space. 264MB including OOB (including ECC)
It has 2084 byte pages + 64 bytes OOB data for each.
64 pages make an erase block. 
2048 bytes/page == 'large page mode'

131072 pages total
2048 blocks total

totalPages > 65536 ---> row_addr_cycles = 3
page_size = 2048 ---> col_addr_cycle = 2

Standard 'partitions' (in the divided'ed up flash chip sense) are:

start			size			description
0x00000000		0x21000			Unknown, contains strings "HMIT" "IMBO" "OLSO"
0x00021000		0x10000			Marvell PXA 'OEM Boot Module' (OBM) Copy 1
0x00031000		0x0F000			OBM Copy 2
0x00040000		0x40000			Windows CE Ethernet Bootloader (for the Intel Zylonite Development Platform)
0x00080000		0x20000			IPL? Second stage of windows boot
0x000A0000		0x01000			ARGS table (used by win CE Ethernet bootloader)
0x000A1000					???
0x000B0000					???
0x001C0000		< 0xE1C0000 (225.75MB)	The main windows block (DSK1)
0x0e380000		0x1900000 (25MB)	The iPAQ File Store area. (IPQ1)
0xfc800000		0x380000 (3.5MB)	??? Remaining

DSK1 is 0x0E0E0000 (224.875MB) total and takes < 0x??? (225.75MB) of actual flash
IPQ1 is 0x018C0000 ( 24.750MB) total and takes 0x1900000 (25.000MB) of actual flash

Was playing with IPL/2nd stage winCE bootloader.
Put it back but windows now won't boot. The bootloaders are ok but it fails later.

ARRRRRRRG. I forgot the OOB data.

For every 2048 byte page there are 64 bytes of Out Of Band (OOB) data.
The last 24 are/can be used by the PXAs NAND controller for hardware ECC.
The rest can be used by OS (and are by winCE)... oops.

Writing in linux has the HW ECC on but doesn't seem to end up with anything in the OOB blocks.

Need a way of saving the flash backup /with/ the OOB data. 


Reg settings in linux:
		ofset	windows		linux		u-boot		after OBM
NDCR 		0	e185dfff	e104dfff	8104dfff	c104dfff
NDTR0CS0	4	00161c3c	00141c1c	00131313	003f3f3f
NDTR1CS0	c	0f3d00a2	0f3d00a2	0a290072	0ff000ff
NDSR		14	00000d03	00000500			00000d03
NDPCR		18	00000000	00000000			00000000
NDBDR0		1C	00000000	00000000			00000000	
NDBDR1		20	00000000	00000000			00000000	
NDREDEL		24	00000000	00000000	
NDDB		40	0000f601	e12fff1e			00000000	
NDCB0		48	000d3000	000d3000	
NDCB1		4C	cbaa0000	00810000	
NDCB2		50	00000000	00000000