[U-Boot] Does U-boot supports Spansion S29GL512P NOR Flash?

[Frank Svendsbøe]

>>> For slow devices, the memory controller is usually setup to use the GPCM.
>>> Check your options and base registers
>>> (OR0 and BR0).
> What is GPCM? Which source/header file I need to check for these settings.?
>

Hi Prakash, I didn't know that a IBM PPC440 CPU didn't contain an
embedded memory controller. I assumed it did and therefore mentioned
the GPCM (General Purpose Chip Select Machine - Terminology used on
Freescale SoCs). Since your controller is obviously external/custom,
it's hard to help you.

>>>You mention different size.. is the port size different too?
> I think u-boot takes care of port size as if we do not define the port size
> then u-boot search with all possible port size.
> BTW how I can cross-check the port size?
>

Hmm.. As I don't have a 440 system, it's hard to tell. But on other
systems, the port-size is programmed for each chip-select, and tells
the memory controller the supported bus width connected to each device
for a given chip-select.

> For M29W128GH I have to do some code fixup from patch suggested by Stefan.
> Is there any special code fixup is required for S29GL512P flash chip
> support?

As I mentioned before, we didn't do anything special in order to get
S29GL512P working for our board.

Best regards,
Frank

>
> Thanks & Regards,
> Prakash
>
>
> On Fri, Apr 9, 2010 at 6:57 PM, Frank Svendsbøe <frank.svendsboe at gmail.com>
> wrote:
>>
>> > I am using PPC440x5 Cpu core. How to check the chip-select flash is
>> > using?
>> > Earlier I have run the same code for M29W128GH and it works fine. But
>> > with
>> > S29GL512 it is not working.
>> > Now the difference is only in size and write/read timings. So I believe
>> > it
>> > should work in smooth manner.
>> >
>>
>> Hmm.. If you're supposed to boot from this device, then I assume the
>> flash is connected to CS0.For slow devices, the memory controller is
>> usually setup to use the GPCM. Check your options and base registers
>> (OR0 and BR0). Everything related to timing (for GPCM controlled
>> devices) is done in these two registers.
>>
>> If you have a BDI JTAG, you can set these registers using that and try
>> to perform flash operations from here. Again, if you can, try to
>> access the flash using the JTAG before experimenting with U-Boot.
>>
>> You mention different size.. is the port size different too?
>>
>> In order to help you, I think the community needs more info about your
>> system. Stefan asked for logs, etc.
>>
>> Regards,
>> Frank
>
>