Cortex M3/M4 with bootloader ROM

On 2013-10-04 18:03, David Brown wrote:
> Does anyone have recommendations for Cortex M3/M4 microcontrollers with
> a bootloader in ROM?  We use a number of Freescale Kinetis devices, but
> there is no ROM bootloader - programming is through either JTAG or the
> EZ-Port (basically treating the chip like an SPI flash device).  We have
> an application where a UART-based bootloader would be very useful, and
> having it in ROM would save a lot of effort and production time (like
> the TI msp430 microcontrollers).  There are vast numbers of M3/M4
> devices available - I am looking for recommendations for ones with a
> simple and clear bootloader protocol.
>
> Thanks,
>
> David
>
I think you find that the Atmel Cortex part can be programmed using the 
USB device port using SAM-BA.

BR
Ulf Samuelsson

Grant Edwards <invalid@invalid.invalid> writes:

> I didn't phrase my posting well.  I've found that Gentoo has ebuilds
> for pretty much all the software I need to use.

I guess I have to agree with that. Android development stuff from Google
and Steam from Valve is just installable the same way as anything
else.

> Maybe things in binary-distribution land have improved, but my recent
> brief expeditions into Ubuntu and RH/CentOS territory haven't given
> any indication that's the case.

Maybe you would like Sabayon instead in the binary-distribution land?
Gentoo based but software is prebuilt. Can still use emerge for stuff
that isn't.

On Sun, 6 Oct 2013 11:36:26 +0000 (UTC)
Uwe Bonnes <bon@hertz.ikp.physik.tu-darmstadt.de> wrote:

> David Brown <david.brown@removethis.hesbynett.no> wrote:
> 
> > I'll look into the LPC families.
> 
> Have also a look at the STM32. They all have USART Bootloader in ROM,
> many parts also DFU bootloader. On F2/3/4 and L1, you can also reach
> the bootloader without setting the  boot pins by using SYSCFG_MEMRMP
> and doing a core-reset (no system reset!).
> 
> Bye
> 

STM32F4 series also bootloads over CAN, as well as USB and serial. And
yes, you can both jump into the bootloader yourself from application
code as well as setting a level on a pin while powering up to get into
the bootloader unconditionally.
-- 
Christopher Head

On Fri, 04 Oct 2013 14:10:18 -0400
Rich Webb <webb.ra@example.net> wrote:

> Works fine. I don't believe that the "Demonstrator" license permits
> redistribution but the protocol is well documented in the app notes
> and you have a known-working app to check against.

If you run Linux (or it may be buildable in Windows as well; I haven&rsquo;t
ever tried), recent versions of dfu-util support the STM32F4 series&rsquo;
USB bootloader.
-- 
Christopher Head