RE: u-boot or equivalent for MCF52223

Thanks.  I hadn't gotten as far as figuring out the size of u-boot.  I'll
check out the dBUG option.

 

Rick

 

 

From: [email protected] [mailto:[email protected]] On
Behalf Of Allon Stern
Sent: Wednesday, April 02, 2008 10:55 AM
To: [email protected]
Subject: Re: [ColdFire] u-boot or equivalent for MCF52223

 

 

On Apr 2, 2008, at 1:14 PM, Seymour David wrote:





Hi Rick,

I imagine that U--boot might be too big for the MCF52223 family's

on-chip memory of 256KB flash and 32KB RAM. But I do not know that fir

sure.

 

u-boot will fit into the flash, for sure.

RAM may be a little tight, but it could probably do it.

but I'm wondering why you'd want to run u-boot on this small cpu.





The dBUG ROM monitor is ported to the MCF5213 (same memory config) and

support s-record downloades.  You can prune it further to only support

the serial download and flash programming.  









Can anyone direct me to an implementation of u-boot or an equivalent

boot

loader for the MCF52223?  Specifically I'm looking for some help

reprogramming the onboard flash through a serial port.  I'm currently

doing

this for a MCF5206e, but I load the whole flash image into external RAM

first.  The MCF52223 does not have an external bus, so no external RAM.

U-boot looks like an option, but I haven't found a port to this

processor.

 

Thanks,

 

Rick Cordray

 

 

Well hm.

 

How about EzPort?

 

"Flash memory may also be programmed via the EzPort, which is a serial flash
memory programming interface that allows the flash memory to be read, erased
and programmed by an external controller in a format compatible with most
SPI bus flash memory chips. "

 

Is that an option?

 

Alternatively, from a quick glance at the reference manual, it appears that
the flash is organized into 8K blocks. 8K < 32K, so you have enough RAM left
over to run dBUG, and buffer at least 2, maybe 3 blocks worth of flash at a
time. Ugly and slow, but would work.

 

Alternatively, have you considered loading the flash via the BDM?

 

-

allon

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