Re: [ECOS] Red-Boot & Multiple Flash IC's

[Gary Thomas <gary at mlbassoc dot com>]

sebastian igielski wrote:
> Hi!
>
> Sorry for my simple questions but generally I'm a hardware engineer and 
> I have little experience with red-boot and ecos environment. I search 
> for the solution over the archive of this mailing list, and a few people 
> says when I have multiple flash IC's I must include second instance of 
> flash driver. Anybody can help me a little? Show the right path or place 
> to search right solution?

There are many examples of how to do this in the public tree.  Look at the
ARM/Integrator platform - it uses 2 banks of 4 Intel FLASH devices.

> sebastian igielski pisze:
> > Hi!
> >
> > We have porting Red-Boot to our platform based on EP9302 
> > microprocessor (produced by Cirrus Logic, ARM920T core inside). I have 
> > one question about using multiple flash IC's connected to different 
> > chip selects, uut at first I must tell something about our hardware 
> > platform.
> >
> > In a few words, we have on board following IC's:
> >
> > 1x MCU: EP9302 (ARM920T core, 16 bit wide data bus)
> > 4x SDRAM (one SDRAM chip have 32Mbyte capacity, four banks - [8MBytes 
> > per bank]) - Total: 128Mbytes of RAM
> > 2x NOR FLASH (JS28F1283D) (connected to two separate chip selects) 
> > (The NOR flash chips is Intel-Strata FLASH IC's.)
> >
> > One NOR-FLASH chip have 16-bit data bus. The NOR-Flash chips is placed 
> > at 0x6000_0000 and 0x7000_0000 in physical memory layout. After 
> > configuring and enabling the MMU the NOR-Flash chips is mapped as 
> > follows (virtual address space):
> >
> > IC #1: 0x6000_0000 - 0x60FF_FFFF
> > IC #2: 0x6100_0000 - 0x61FF_FFFF
> >
> > And now is my question about Red-Boot environment. It is possible to 
> > (and how to do it) use both NOR flash chips?
> > Now I have working only one chip (placed at virtual address: 
> > 0x6000_0000-0x60FF_FFFF).
> >
> > I have no idea how to tell Red-Boot/Strata Flash driver to see my 
> > second NOR-Flash chip. It is possible to RedBoot handle this kind of 
> > hardware configuration?
> >
> > Some people told me that I must modify the "CYGNUM_FLASH_DEVICES", but 
> > in my humble opinion this variable defines the FLASH IC's needed to 
> > coverage the data bus by multiple FLASH IC's (for example: when I have 
> > 32 bit wide data bus, and when I have two 16 bit FLASH IC's to 
> > coverage 32-bit data bus - in that case CYGNUM_FLASH_DEVICES must be 
> > set to 2). I'm correct?
> >
> > In our hardware the data bus is 16-bit wide and FLASH IC is 16 bit 
> > wide (so one flash chip coverage all data bus), the second FLASH IC is 
> > used to extend size of flash memory size. As i written above, I have 
> > working first FLASH CHIP. And I don't know to add second chip to 
> > RedBoot environment.
> >
> > If anybody can suggest me right solution of my problem, or give any 
> > helpful idea I will be graceful.
> >
> > I have ecos-2.0 package.
> >
> > with regards
> > Sebastian Igielski


--
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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