[U-Boot-Users] How to set up Am29LV641D flash on MPC5200B

[TXEMA LOPEZ]

Hi Edward,
Is the Am29LV652D CFI compliant? If the answer is yes: why not use the U-Boot CFI interface? The porting for the Lite5200B use the generic CFI interface (It is not the case of the Lite5200 (IceCube) porting).
If not you can debug with the BDI2000 the flash_get_size() function in /board/icecube/flash.c to see what is happening.


Best Regards,

 -----Mensaje original-----
De: 	u-boot-users-bounces at lists.sourceforge.net [mailto:u-boot-users-bounces at lists.sourceforge.net]  En nombre de Edward Jubenville
Enviado el:	miércoles, 12 de julio de 2006 19:10
Para:	u-boot-users at lists.sourceforge.net
Asunto:	[U-Boot-Users] How to set up Am29LV641D flash on MPC5200B

I'm having some problems porting U-Boot to a custom board based closely on
the original Freescale Lite5200 IceCube (not the newer Lite5200B).
Specifically, I am having problems getting U-Boot to recognize our flash
memory.

Our board differs from the original design in a few key ways:
- uses MPC5200B processor instead of MPC5200
- the original Freescale design used the Non-MUX 24 address bit / 8 data
bits from the LocalPlus bus, but we operate MUXed with 25 bit address bits
and 16 data bits.
- uses Am29LV641D flash memory instead of Am29LV652D

I am using u-boot-1.1.4, but modified TEXT_BASE to run out of RAM at
0x200000 (which seems to be working fine on our board).

I'm a newbie at u-boot porting, so I may have done something stupid.
Because our design is closer to the original IceCube design than the newer
Lite5200B design, I cloned the board/icecube folder as the starting point of
my new board.  I couldn't get u-boot to reach a command prompt until I read
the Freescale appnote "AN3220 U-Boot Porting Guide", and changed the IPB bus
speed to 133MHz as recommended for the MPC5200B processor.  Other than that,
I built u-boot identically to a Lite5200 board.

At the U-boot prompt, the flinfo command tells me that flash is
unrecognized.  I inspected MBAR+0x300, and it had a value of 0x00047800,
which I interpreted to be correct for an 8-bit bus, not a 16-bit bus.  After
searching the u-boot code for how that gets set, I added this line to my
include/configs/<board>.h file:
	#define CFG_CS0_CFG             0x0004F900
hoping to get flash properly reconfigured for a 16-bit MUXed bus.
After rebuild, inspection of MBAR+0300 showed the new value, but u-boot
still didn't recognize the flash.

Any help, please?

I have a BDI2000, if that would help me find/fix the problem.

Thanks,

Ed Jubenville




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