Lpc2000

Is there some example code of such second stage bootloader
that you use in your project?

Thanks in advance,

Srdan

--- In lpc2000@yahoogroups.com, Richard Duits <yahoo@...> wrote:
>
> I only use the interrupt vector which jumps to the address read from
the 
> VIC and the SWI vector, which jumps to a fixed address. But you also 
> copy your vectors to RAM and use the MEMMAP register to remap the 
> interrupt vectors to RAM. Read the "MEMORY MAPPING CONTROL" section in 
> the user manual to see how this works.
> 
> Richard.
> 
> 
> 
> Srdan Suka wrote:
> > Thanks Richard
> >
> > This solution sounds ok and it seems better than use
> > ISP commands.
> > How did you solve the problem with reallocation
> > of exception vectors?
> >
> > Thanks again,
> >
> > Srdan
> >
> >
> >
> > --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@> wrote:
> > >
> > > I implemented a second stage bootloader in the first flash
sector that
> > > is able to update the flash via a FTDI FT245 usb link. The
bootloader
> > > checks a signature (a CRC is also possible) and if this is
correct, it
> > > starts the program from the second flash sector. The program can
> > jump to
> > > a fixed address (immediately after the exception vectors) to
erase the
> > > program and start an update procedure.
> > >
> > > If the update fails, my own bootloader in the first sector will not
> > > start the program in the second sector because of an incorrect
> > signature
> > > or crc and it will run in update mode until a correct program is
> > uploaded.
> > >
> > > A disadvantage is that you need to relocate the exception vectors to
> > ram
> > > or use the fixed exception vector table from the bootloader. Another
> > > disadvantage is (at least with the keil ide) is that the debugger /
> > jtag
> > > flash programmer does not know how to handle a program that does not
> > use
> > > sector 0 which I solved by always including the bootloader code
in the
> > > ide project.
> > >
> > > Regards,
> > > Richard.
> > >
> > >
> > > Srdan Suka wrote:
> > > > Hi everyone!
> > > >
> > > > I am using LPC2103 in my project. LPC is connected to server using
> > > > RS485 interface (Semi-duplex). Also I have EEPROM memory
connected to
> > > > LPC.
> > > > I would like to do this if it is possible:
> > > >
> > > > 1. Using my resident LPC firmware, load new firmware to EEPROM
memory.
> > > > 2. Load a small program into Flash into first available sector
> > > >    (this program I would like to use to copy new firmware from
> > > >     EEPROM to Flash over the existing firmware).
> > > >
> > > > Is it possible to use ISP GO command to execute "Copy
proggram" from
> > > > Flash to start copying firmware from EEPROM to flash memory.
> > > > What will happen it copy process fails and I overwrite firmware at
> > > > 0x0000 0000 address?
> > > > Can I "tell" the bootloader alwayws to start the "Copy program"
> > unless I
> > > > "tell" it that the updating is finishead and the main firmware
should
> > > > be started?
> > > >
> > > > Has anyone tried this?
> > > >
> > > > Thanks :)
> > > >
> > > > Srdan
> > > >
> > > >
> > >
> >
> >
> >
> >
> >
> >
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