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2005-10-06 by tripple_toast
I have managed to store in a flash sector code that is compiled to run from RAM. At boot I wish to copy this code from flash to RAM and then run the code in RAM. Is this possible using the LPC213x? What do I need to do in the boot file of the flash code to get the RAM code running? Thanks.
2005-10-06 by Richard Duits
This depends on the compiler/tools you use. With GNU you can do this in the linker script and startup.s (similar to initialized variables). The Keil compiler has a function attribute that lets you run some functions from ram. Don't know about other compilers. Richard Duits. tripple_toast wrote:
> I have managed to store in a flash sector code that is compiled to > run from RAM. At boot I wish to copy this code from flash to RAM and > then > run the code in RAM. > > Is this possible using the LPC213x? > > What do I need to do in the boot file of the flash code to get the RAM > code running? > > Thanks. > > > > > > SPONSORED LINKS > Microprocessor > <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-J9hJ5qyXg0WPR0l6g> > Microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq01nxwg> > Pic microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c6LyBvUqVQ> > > 8051 microprocessor > <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVIlekkDP-A> > > > > ------------------------------------------------------------------------ > YAHOO! GROUPS LINKS > > * Visit your group "lpc2000 > <http://groups.yahoo.com/group/lpc2000>" on the web. > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > > ------------------------------------------------------------------------ >
2005-10-06 by tripple_toast
Thanks for the reply. So all I need is a section of assembler in boot.s that copies the compiled RAM code from flash to RAM. I've tried the approach of altering the initialised variables routine without success ( my arm assembler knowledge is not so good ). Once this is copied then how does the RAM code run. Is it a matter of setting PC to a RAM start address? I'm ensuring that the RAM code is not using any of the ISP RAM area by loading it into 0x40000200 Will I need to set MEMMAP to RAM, I'm not using any IRQ's? --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote: > This depends on the compiler/tools you use. With GNU you can do this in > the linker script and startup.s (similar to initialized variables). The > Keil compiler has a function attribute that lets you run some functions > from ram. Don't know about other compilers. > > Richard Duits. > > > > > tripple_toast wrote: > > > I have managed to store in a flash sector code that is compiled to > > run from RAM. At boot I wish to copy this code from flash to RAM and > > then > > run the code in RAM. > > > > Is this possible using the LPC213x? > > > > What do I need to do in the boot file of the flash code to get the RAM > > code running? > > > > Thanks. > > > > > > > > > > > > SPONSORED LINKS > > Microprocessor > > <http://groups.yahoo.com/gads? t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+mic rocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC- J9hJ5qyXg0WPR0l6g> > > Microcontrollers > > <http://groups.yahoo.com/gads? t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+m icrocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq0 1nxwg> > > Pic microcontrollers > > <http://groups.yahoo.com/gads? t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=P ic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c 6LyBvUqVQ> > > > > 8051 microprocessor > > <http://groups.yahoo.com/gads? t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pi c+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVI lekkDP-A> > > > > > > > > ------------------------------------------------------------------ ------ > > YAHOO! GROUPS LINKS > > > > * Visit your group "lpc2000 > > <http://groups.yahoo.com/group/lpc2000>" on the web. > > > > * To unsubscribe from this group, send an email to: > > lpc2000-unsubscribe@yahoogroups.com > > <mailto:lpc2000-unsubscribe@yahoogroups.com? subject=Unsubscribe> > > > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > > Service <http://docs.yahoo.com/info/terms/>. > > > > > > ------------------------------------------------------------------ ------ > >
2005-10-06 by Richard Duits
I assume you use GCC. You also need to change the linker script to let the linker know that the code is stored in flash but it will be running from RAM (just like the initialized variables section). When you copied the code to ram, you just load the address of your main routine in pc. If you use interrupts, you may change the MEMMAP register, but this is not needed because the MAM will cache the bytes used by the interrupt vector and it will run just as fast as in RAM. I never did this myself, so I have no example code to share with you, maybe someone else? Richard Duits tripple_toast wrote:
> Thanks for the reply. > > So all I need is a section of assembler in boot.s that copies the > compiled RAM code from flash to RAM. > I've tried the approach of altering the initialised variables routine > without success ( my arm assembler knowledge is not so good ). > > Once this is copied then how does the RAM code run. Is it a matter > of setting PC to a RAM start address? > > I'm ensuring that the RAM code is not using any of the ISP RAM area > by loading it into 0x40000200 > > Will I need to set MEMMAP to RAM, I'm not using any IRQ's? > > > > --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote: > > This depends on the compiler/tools you use. With GNU you can do > this in > > the linker script and startup.s (similar to initialized variables). > The > > Keil compiler has a function attribute that lets you run some > functions > > from ram. Don't know about other compilers. > > > > Richard Duits. > > > > > > > > > > tripple_toast wrote: > > > > > I have managed to store in a flash sector code that is compiled to > > > run from RAM. At boot I wish to copy this code from flash to RAM > and > > > then > > > run the code in RAM. > > > > > > Is this possible using the LPC213x? > > > > > > What do I need to do in the boot file of the flash code to get > the RAM > > > code running? > > > > > > Thanks. > > > > > > > > > > > > > > > > > > SPONSORED LINKS > > > Microprocessor > > > <http://groups.yahoo.com/gads? > t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+mic > rocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC- > J9hJ5qyXg0WPR0l6g> > > > Microcontrollers > > > <http://groups.yahoo.com/gads? > t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+m > icrocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq0 > 1nxwg> > > > Pic microcontrollers > > > <http://groups.yahoo.com/gads? > t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=P > ic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c > 6LyBvUqVQ> > > > > > > 8051 microprocessor > > > <http://groups.yahoo.com/gads? > t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pi > c+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVI > lekkDP-A> > > > > > > > > > > > > ------------------------------------------------------------------ > ------ > > > YAHOO! GROUPS LINKS > > > > > > * Visit your group "lpc2000 > > > <http://groups.yahoo.com/group/lpc2000>" on the web. > > > > > > * To unsubscribe from this group, send an email to: > > > lpc2000-unsubscribe@yahoogroups.com > > > <mailto:lpc2000-unsubscribe@yahoogroups.com? > subject=Unsubscribe> > > > > > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > > > Service <http://docs.yahoo.com/info/terms/>. > > > > > > > > > ------------------------------------------------------------------ > ------ > > > > > > > > SPONSORED LINKS > Microprocessor > <http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-J9hJ5qyXg0WPR0l6g> > Microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq01nxwg> > Pic microcontrollers > <http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c6LyBvUqVQ> > > 8051 microprocessor > <http://groups.yahoo.com/gads?t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVIlekkDP-A> > > > > ------------------------------------------------------------------------ > YAHOO! GROUPS LINKS > > * Visit your group "lpc2000 > <http://groups.yahoo.com/group/lpc2000>" on the web. > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > > ------------------------------------------------------------------------ >
2005-10-07 by tripple_toast
Hi Richard,
Thanks for being my sounding block, I've now got the RAM code stored
in flash running from RAM at boot.
>>I assume you use GCC.
GNUARM
>>You also need to change the linker script to let
>>the linker know that the code is stored in flash but it will be
running
>>from RAM (just like the initialized variables section).
At the moment my boot app just uses hardcoded addresses to relocate
the RAM code, are you saying I should use the linker script for the
boot app and create a new section similar to the initialised
variables section i.e.
.data : AT (_etext)
{
_data = .;
*(.data)
} > RAM
--- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote:
>
> I assume you use GCC. You also need to change the linker script to
let
> the linker know that the code is stored in flash but it will be
running
> from RAM (just like the initialized variables section). When you
copied
> the code to ram, you just load the address of your main routine in
pc.
> If you use interrupts, you may change the MEMMAP register, but this
is
> not needed because the MAM will cache the bytes used by the
interrupt
> vector and it will run just as fast as in RAM. I never did this
myself,
> so I have no example code to share with you, maybe someone else?
>
> Richard Duits
>
>
> tripple_toast wrote:
>
> > Thanks for the reply.
> >
> > So all I need is a section of assembler in boot.s that copies the
> > compiled RAM code from flash to RAM.
> > I've tried the approach of altering the initialised variables
routine
> > without success ( my arm assembler knowledge is not so good ).
> >
> > Once this is copied then how does the RAM code run. Is it a
matter
> > of setting PC to a RAM start address?
> >
> > I'm ensuring that the RAM code is not using any of the ISP RAM
area
> > by loading it into 0x40000200
> >
> > Will I need to set MEMMAP to RAM, I'm not using any IRQ's?
> >
> >
> >
> > --- In lpc2000@yahoogroups.com, Richard Duits <yahoo@r...> wrote:
> > > This depends on the compiler/tools you use. With GNU you can do
> > this in
> > > the linker script and startup.s (similar to initialized
variables).
> > The
> > > Keil compiler has a function attribute that lets you run some
> > functions
> > > from ram. Don't know about other compilers.
> > >
> > > Richard Duits.
> > >
> > >
> > >
> > >
> > > tripple_toast wrote:
> > >
> > > > I have managed to store in a flash sector code that is
compiled to
> > > > run from RAM. At boot I wish to copy this code from flash to
RAM
> > and
> > > > then
> > > > run the code in RAM.
> > > >
> > > > Is this possible using the LPC213x?
> > > >
> > > > What do I need to do in the boot file of the flash code to get
> > the RAM
> > > > code running?
> > > >
> > > > Thanks.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > SPONSORED LINKS
> > > > Microprocessor
> > > > <http://groups.yahoo.com/gads?
> >
t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+mic
> > rocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-
> > J9hJ5qyXg0WPR0l6g>
> > > > Microcontrollers
> > > > <http://groups.yahoo.com/gads?
> >
t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+m
> >
icrocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq0
> > 1nxwg>
> > > > Pic microcontrollers
> > > > <http://groups.yahoo.com/gads?
> >
t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=P
> >
ic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c
> > 6LyBvUqVQ>
> > > >
> > > > 8051 microprocessor
> > > > <http://groups.yahoo.com/gads?
> >
t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pi
> >
c+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVI
> > lekkDP-A>
> > > >
> > > >
> > > >
> > > > --------------------------------------------------------------
----
> > ------
> > > > YAHOO! GROUPS LINKS
> > > >
> > > > * Visit your group "lpc2000
> > > > <http://groups.yahoo.com/group/lpc2000>" on the web.
> > > >
> > > > * To unsubscribe from this group, send an email to:
> > > > lpc2000-unsubscribe@yahoogroups.com
> > > > <mailto:lpc2000-unsubscribe@yahoogroups.com?
> > subject=Unsubscribe>
> > > >
> > > > * Your use of Yahoo! Groups is subject to the Yahoo!
Terms of
> > > > Service <http://docs.yahoo.com/info/terms/>.
> > > >
> > > >
> > > > --------------------------------------------------------------
----
> > ------
> > > >
> >
> >
> >
> >
> > SPONSORED LINKS
> > Microprocessor
> > <http://groups.yahoo.com/gads?
t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+mic
rocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC-
J9hJ5qyXg0WPR0l6g>
> > Microcontrollers
> > <http://groups.yahoo.com/gads?
t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+m
icrocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8Xq0
1nxwg>
> > Pic microcontrollers
> > <http://groups.yahoo.com/gads?
t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=P
ic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ7c
6LyBvUqVQ>
> >
> > 8051 microprocessor
> > <http://groups.yahoo.com/gads?
t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pi
c+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_HVI
lekkDP-A>
> >
> >
> >
> > ------------------------------------------------------------------
------
> > YAHOO! GROUPS LINKS
> >
> > * Visit your group "lpc2000
> > <http://groups.yahoo.com/group/lpc2000>" on the web.
> >
> > * To unsubscribe from this group, send an email to:
> > lpc2000-unsubscribe@yahoogroups.com
> > <mailto:lpc2000-unsubscribe@yahoogroups.com?
subject=Unsubscribe>
> >
> > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > Service <http://docs.yahoo.com/info/terms/>.
> >
> >
> > ------------------------------------------------------------------
------
> >
>2005-10-07 by Richard Duits
It may be easier to add the *(.text) to the initialized data section. It may be a bit of a hack, but this way you you can leave to startup/boot code unchanged (just tought of this, otherwise I would have mentioned it sooner). Make sure that the startup/boot code is in flash if you do this. tripple_toast wrote:
> Hi Richard,
>
> Thanks for being my sounding block, I've now got the RAM code stored
> in flash running from RAM at boot.
>
> >>I assume you use GCC.
>
> GNUARM
>
> >>You also need to change the linker script to let
> >>the linker know that the code is stored in flash but it will be
> running
> >>from RAM (just like the initialized variables section).
>
> At the moment my boot app just uses hardcoded addresses to relocate
> the RAM code, are you saying I should use the linker script for the
> boot app and create a new section similar to the initialised
> variables section i.e.
>
> .data : AT (_etext)
> {
> _data = .;
> *(.data)
> } > RAM
>
>