Layout:

0x000-0x0ff	System configuration area
0x100-0x1ff	NAND flash HC configuration area
0x200-0x2ff	SD HC config. area
0x300-0x3ff	USB HC config area
0x400-0x4ff	Serial HC config area
0x500-0x5ff	LCD HC config area
0x600-0x7ff	Reserved config space

0x0800-0xffff	Control register space

0x10000-0x17fff	Local Memory area 0 (32K)
0x18000-0x1ffff	Local Memory area 0 (32K) (alias)

0x100000-0x1fffff	Local Memory area 1 (1MB)

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Registers
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System configuration area

0x08	Chip revision
		e740 asic == rev 2
		    SD
		    USB
		TC6393XBA == rev 3   (e750 e800)
		    NAND
		    SD
		    USB
		    Serial?
		    LCD?

0x50	Interrupt register
  0:7		Interrupt status
    2:		  SD IRQ (at least for inserts)
    4:		  OHCI IRQ
 15:23		Interrupt mask

0x54	Interrupt mask
  0:8		Interrupt mask bits   (appears to be orred with 0x52 internally)

0x60	GPIO enable
0x61	GPIO enable

0x98	PLL2 / Clock control regs
  0:15		Clock control
    0:		CK32KEN
    1:		USBCKEN
    8:10	MCLKSEL[2:0]
	000	 0MHz	PLL1 Disabled
	001	12MHz	Enabled
	010	24MHz	Enabled
	011	48MHz	Enabled
	1XX	48MHz	Enabled
   12:13	HCLKSEL[1:0]
	00 (Default)	Host bus clock 24MHz
	01         	Host bus clock 48MHz (SD will not run)
	1x         	Reserved
 16:31		PLL2 Control

0x9C	PLL1 Control reg
  0:31		PLL1 Control

0xA0	Device regs
  0:7		Device Internal Active Register Control
  8:15		Device Buffer Off Control

0xE0	Function Enable
  0:		USBEN
		WARNING: attempts to read from USB address space when this is clear will hang the system
  1:		LCDCVEN
  2:		SLCDEN

0xE4	Mode control 0 register
  0:1		RDYST[1:0]                ---HRDY related
	00	Open Drain
	01	tristate
	10	push-pull
	11	reserved
  3:		AREN                      ---HRDY related
  4:5		INTST[1:0]                ---HINT related
	00	Open drain
	01	tristate
	10	push-pull
	11	Reserved
  7:		AIEN   (interupt enable?) ---HINT related