Lenovo n200 flash enable

BAR table:
	PMBASE		00:1f.0[0x40]
	GPIOBASE	00:1f.0[0x48]
	EC_IO		0xff2c

Port definition table:
	PM1_CNT		PMBASE + 0x04	(Power Management 1 Control, 4 bytes)
	  SCI_EN	(1 << 0)	(SCI Enable)
	SMI_EN		PMBASE + 0x30	(SMI Control and Enable, 4 bytes)
	  GBL_SMI_EN	(1 << 0)
	GP_IO_SEL	GPIOBASE + 0x04	(GPIO Input/Output Select, 4 bytes)
	GP_LVL		GPIOBASE + 0x0C	(GPIO Level for Input or Output, 4 bytes)
	EC_IDX_H	EC_IO + 1	(EC Indexed IO High Address, 1 byte)
	EC_IDX_L	EC_IO + 2	(EC Indexed IO Low Address, 1 byte)
	EC_IDX_DATA	EC_IO + 3	(EC Indexed IO Data, 1 byte)

PCI register table:
	GEN2_DEC	00:1f.0[0x88]	(LPC I/F Generic Decode Range 2, 4 bytes)
	  GEN2_EN	(1 << 0)	(Generic Decode Range 2 Enable)
	BIOS_CNTL	00:1f.0[0xdc]	(BIOS Control, 1 byte)
	  BIOSWE	(1 << 0)	(BIOS Write Enable)

EC register table:
	PXCFG		0xff14		(EC 8051 On-Chip Control)
	  PC_CNTL	(1 << 0)	(When bit is set, EC is held in reset w/PC=0)

EC KBC indices:
	SYS_ST_NOTIF	0x59		(System State Notification)

EC KBC commands:
	DIS_FAN_FULL_ON	0x77		(Disable Fan Speed Full On)
	ENTER_FLASH	0xf2		(Enter Flash Mode)

EC command procedure:
1.	Loop:
1a.		Read 0x64
1b.		If bit 0 is clear, break
1c.		Read 0x60
2.	Loop:
2a.		Read 0x64
2b.		If bit 1 is clear, break
3.	Write desired EC KBD index to 0x64
3a.		Perform the loop in step 2
4.	Write desired EC KBD command to 0x60
4a.		Perform the loop in step 2

EC indexed IO read:
1.	Write the low byte of the desired EC IO space to EC_IDX_L
2.	Write the high byte of the desired EC IO space to EC_IDX_H
3.	Read from EC_IDX_DATA

EC indexed IO write:
1.	Write the low byte of the desired EC IO space to EC_IDX_L
2.	Write the high byte of the desired EC IO space to EC_IDX_H
3.	Write the desired data to EC_IDX_DATA

Board enable procedure:
1.	BIOS_CNTL |= BIOSWE
2.	Allow IO access to EC_IO
2a.		GEN2_DEC[0,1] = EC_IO
2b.		GEN2_DEC |= GEN2_EN
3.	[check bit 0 (SCI_EN) in port PM1_CNT]
3a.		If if is set, skip to step 5
4.	[twiddle USB bits]
5.	Send an EC command with index SYS_ST_NOTIF and command DIS_FAN_FULL_ON
6.	Send an EC command with index SYS_ST_NOTIF and command ENTER_FLASH
7.	Loop:
7a.		Read the EC indexed IO data from 0xf554 (EC_XRAM + 0x0154)
7b.		If the data is equal to 0xa5, break
8.	PXCFG |= PC_CNTL (via EC indexed IO)
9.	Lower ICH GPIO24
9a.		SMI_EN &= ~(GBL_SMI_EN)
9b.		GP_IO_SEL[3] &= 0xfe
9c.		GP_LVL[3] &= 0xfe
10.	Raise or lower ICH GPIO27 depending on a configuration parameter
10a.		GP_LVL[3] |= 0x08
10b.		If $FOO: GP_LVL[3] &= 0xf7