[U-Boot] Problem with flash on a MPC5200B board

[Sylvain Lamontagne]

Hi Everyone

I'm pretty new to U-Boot and Embedded system globally, but in the last few
weeks I have learn a lot and I'm now trying to port correctly U-Boot v 1.3.4
to a custom board based on a Icecube. I'm able to boot a linux kernel with
it when I use the RAM with the bootm command.

Unfortunately, I must make it work with the FLASH. The chip used for the
flash is a S29GL128 or a S29GL256 from Spansion, they are 16bits chips but
the bus is only 8bits. By reading the datasheet, these chips are supposed to
support the Common Flash Interface so I'm trying to make then work with the
CFI driver of U-Boot.

Here is what I get when booting with DEBUG activated:

U-Boot 1.3.4 (Oct  7 2008 - 16:39:49)
>
> CPU:   MPC5200B v2.2, Core v1.4 at 378 MHz
>       Bus 84 MHz, IPB 84 MHz, PCI 21 MHz
> Board: Icecube Based Board
> I2C:   93 kHz, ready
> DRAM:  64 MB
> Top of RAM usable for U-Boot at: 04000000
> Reserving 551k for U-Boot at: 03f76000
> Reserving 130k for malloc() at: 03f55800
> Reserving 68 Bytes for Board Info at: 03f557bc
> Reserving 60 Bytes for Global Data at: 03f55780
> Stack Pointer at: 03f55768
> New Stack Pointer is: 03f55768
> Now running in RAM - U-Boot at: 03f76000
> FLASH: flash detect cfi
> fwc addr ff000000 cmd f0 f0 8bit x 8 bit
> fwc addr ff000000 cmd f0 f0 8bit x 8 bit
> fwc addr ff000055 cmd 98 98 8bit x 8 bit
> is= cmd 51(Q) addr ff000010 is= 0 51
> fwc addr ff000555 cmd 98 98 8bit x 8 bit
> is= cmd 51(Q) addr ff000010 is= 0 51
> fwc addr ff000000 cmd f0 f0f0 16bit x 8 bit
> fwc addr ff000000 cmd f0 f0f0 16bit x 8 bit
> fwc addr ff0000aa cmd 98 9898 16bit x 8 bit
> is= cmd 51(Q) addr ff000020 is= 5151 5151
> is= cmd 52(R) addr ff000022 is= 5252 5252
> is= cmd 59(Y) addr ff000024 is= 5959 5959
> device interface is 2
> found port 2 chip 1 port 16 bits chip 8 bits
> 00 : 51 52 59 02 00 40 00 00 00 00 00 27 36 00 00 06  QRY.. at .....'6...
> 10 : 06 09 13 03 05 03 02 19 02 00 06 00 01 ff 00 00  ................
> 20 : 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20  ...............
> fwc addr ff000000 cmd f0 f0f0 16bit x 8 bit
> fwc addr ff001554 cmd aa aaaa 16bit x 8 bit
> fwc addr ff000aaa cmd 55 5555 16bit x 8 bit
> fwc addr ff001554 cmd 90 9090 16bit x 8 bit
> fwc addr ff000000 cmd f0 f0f0 16bit x 8 bit
> fwc addr ff0000aa cmd 98 9898 16bit x 8 bit
> manufacturer is 2
> manufacturer id is 0x5
> device id is 0x56
> device id2 is 0x0
> cfi version is 0x3133
> size_ratio 1 port 16 bits chip 8 bits
> found 1 erase regions
> erase region 0: 0x020000ff
> erase_region_count = 256 erase_region_size = 131072
> ERROR: too many flash sectors
> fwc addr ff000000 cmd f0 f0 8bit x 8 bit
> flash_protect ON: from 0xFFF00000 to 0xFFF43FFF
> flash_protect ON: from 0xFFFE0000 to 0xFFFFFFFF
> 32 MB
> basetask = 0, tasks = 2
> task_org = 0x03fb4c00
> TDT start = 0x00000040, end = 0x000001b8
> PCI:   Bus Dev VenId DevId Class Int
> PCI Scan: Found Bus 0, Device 24, Function 0
>        00  18  168c  001b  0200  00
> PCI Scan: Found Bus 0, Device 26, Function 0
>        00  1a  1057  5809  0680  00
> In:    serial
> Out:   serial
> Err:   serial
> U-Boot relocated to 03f76000
> Net:   mpc5xxx_fec_init_phy... Begin
> mpc5xxx_fec_init_phy... Done
> FEC ETHERNET
>
> Type "boot" to boot to Linux (default)
> Type "help" for a list of commands


So I got an "ERROR: too many flash sectors" and a 32 MB size ... I know for
sure that the chip is 16 MB so there is a kind of inconsistency...
I'm also a bit confuse about what "#define" I should use to force my board
to communicate in 8bit even if it's capable of 16bit.
I though that I simply had to "#undef FLASH_CFI_16BIT" but that doesn't seem
to do the trick.

I'm not sure to understand the debug output I got...
fwc addr ff000000 cmd f0 f0 8bit x 8 bit
...
fwc addr ff000000 cmd f0 f0f0 16bit x 8 bit

Also is the value of erase_region_count = 256 should be the number of sector
on the chip ???? Because I know that the ship have a maximum of 128
sectors...
If someone could brief me a bit about the debug output posted above I would
greatly appreciate.

I'm pretty sure I have nearly complete the port except for this FLASH
issue...

Help/Suggestion/Comments are welcome

Thank you

Sylvain