Lpc2000

Thanks Massimo.

Does anyone know where to find examples or documentations about code 
relocation? I am using arm-elf tools.

Gilles

--- In lpc2000@yahoogroups.com, Micron Engineering <micronpn@t...> 
wrote:
> Ok, then if you need to write a bootloader it is a different thing.
> 1. Start studing the possibility to use LPC way to program the 
flash 
> with ISP bootloader and/or using JTAG
> 2. If the previous approach doesn't work for you, you have 
basically to 
> store in flash your bootloader (but it is compiled to work residing 
in ram)
> and then when you need to program the flash:
> - copy bootloader code in ram
> - start executing code from ram
> - use some space in ram to collect data to program on flash (a 
block 
> multiple i.e. 2KB)
> - program flash coping data from ram to flash
> - provide a communication protocol with some arbitration because 
write 
> to flash takes some time
> - provide the communication protocol with a command to reset the LPC
> - provide a timeout in bootloader code to automatically reset the 
LPC if 
> no data received for more then x milliseconds.
> I wrote some bootloaders for various microcontrollers to use 
different 
> interfaces to program microcontrollers or flash chips working in 
this 
> way and they perform very well. May be that you also require some 
sort 
> of ram backup and some sort of security if the programming 
procedure 
> stops before the end (i.e. power failure). Due t the big ram space 
on 
> LPC microcontrollers may be not so difficult to obtain these goals. 
> Remember that ARM7 is a RISC microcontroller with no different 
address 
> space for data and code, so you have only to write a relocatable 
program.
> Best regards,
> Massimo Manca, Micron Engineering
> 
> gilles_baracoda wrote:
> 
> > Actually what I would like to do is upgrade the code of the 
MCU...so
> > I have no choice but writing the internal flash!
> >
> > Thanks for the reply anyway.
> > Regards,
> >
> > Gilles
> >
> > --- In lpc2000@yahoogroups.com, Micron Engineering <micronpn@t...>
> > wrote:
> > > I think that if you haven't a lot of data to write it is more
> > simple and
> > > time efficient to use a simple I2C  eeprom or  an SPI eeprom
> > external
> > > connected to the LPC. Flash programming generally is used to 
write
> > > calibration data and so on during production or calibration not
> > many times.
> >
> >
> >
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