stm32 external SRAM
Jython
googcheng at gmail.com
Tue Jun 18 01:25:35 UTC 2019
my linkscmd is https://gist.github.com/goog/aad6dae4c418255dd6fb2b23bf2e6f08
void BSP_START_TEXT_SECTION bsp_start_hook_1(void)
> {
> SRAM_fsmc_setup();
> bsp_start_copy_sections();
> bsp_start_clear_bss();
>
> /* At this point we can use objects outside the .start section */
> }
>
but now my code run disordered
On Mon, Jun 17, 2019 at 2:45 PM Christian Mauderer <
christian.mauderer at embedded-brains.de> wrote:
> If you put any sections into the external RAM that need initialization,
> you have to init the RAM before the BSP copies it's sections. The STM32
> BSP copies it's sections in bsp_start_hook_1(). So either put it in
> bsp_start_hook_0 or in bsp_start_hook_1 before the copy_section calls.
> Attention: You can't use much in these functions. They are in a very
> early initialization stage. So be careful what you put there.
>
> If you only want malloc to allocate memory from there, there might is a
> later point where you can do that.
>
> On 17/06/2019 08:32, Jython wrote:
> > Thank you and the example! that is to say put extern sram init in
> > bsp_start( void ) function?
> >
> > On Mon, Jun 17, 2019 at 1:04 PM Christian Mauderer
> > <christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>> wrote:
> >
> > On 17/06/2019 03:05, Jython wrote:
> > > STM32:
> > > 112KB at 2000 0000
> > > 16KB at 2001 C000
> > >
> > > external sram : 1MB at 0x68000000
> > >
> > > does MEMORY layout support RAM2?
> >
> > Hello Jython,
> >
> > you can distribute the regions to the two RAMs. For example this BSP
> > does that:
> >
> >
> https://git.rtems.org/rtems/tree/bsps/arm/lpc32xx/start/linkcmds.lpc32xx_phycore
> >
> > Please note that you have to take a detailed look at what is used
> till
> > your external RAM initialization run and what not. But if you put
> your
> > external RAM initialization in an early enough step, you shouldn't
> get
> > problems with that.
> >
> > Best regards
> >
> > Christian
> >
> > >
> > > On Fri, Jun 14, 2019 at 10:13 PM Christian Mauderer
> > > <christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>>> wrote:
> > >
> > > If you have already added the chip and it is initialized
> > during startup,
> > > you most likely have to add a section for it in your linker
> > command
> > > file. Depending on where your internal RAM is located and
> > where the
> > > external one is: If they are continuous that can be enough.
> > >
> > > Best regards
> > >
> > > Christian
> > >
> > > On 14/06/2019 04:42, Jython wrote:
> > > > we have added 1M ram by FSMC, and want to manage it by
> > system malloc
> > > > controler
> > > >
> > > > On Fri, Jun 14, 2019 at 10:26 AM Mr. Andrei Chichak
> > > <groups at chichak.ca <mailto:groups at chichak.ca>
> > <mailto:groups at chichak.ca <mailto:groups at chichak.ca>>
> > > > <mailto:groups at chichak.ca <mailto:groups at chichak.ca>
> > <mailto:groups at chichak.ca <mailto:groups at chichak.ca>>>> wrote:
> > > >
> > > > A 407 doesn’t normally have external RAM.
> > > >
> > > > ARMs have flash at 0 and the 407 has RAM at 0x2000 0000
> > as you
> > > > discussed earlier.
> > > >
> > > > If you want to work with external flash or RAM, you have
> > to set up
> > > > the FSMC or FMC to support it, but that isn’t a part of
> > the dev
> > > > board that Sebastian used for the BSP port.
> > > >
> > > > The external memory is going to be very specific to your
> > board.
> > > > Which board are you working with?
> > > >
> > > > A
> > > >
> > > > > On 2019-June-13, at 06:23, Christian Mauderer
> > > > <christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>>
> > > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>>>> wrote:
> > > > >
> > > > > On 05/06/2019 02:55, Jython wrote:
> > > > >> Hello!
> > > > >>
> > > > >> 2. In the normal (non-debugging) case, the linker
> > > script still
> > > > >> places the
> > > > >>
> > > > >> .text section near zero, but places the start of
> the
> > > .data and
> > > > .bss
> > > > >> sections at the start location of the MPC555's
> > internal
> > > RAM. The
> > > > >> system startup code then configures the external
> > RAM just
> > > > after the
> > > > >> internal RAM in memory, forming one large block
> > from the
> > > two RAM
> > > > >> devices.
> > > > >>
> > > > >> from https://devel.rtems.org/wiki/TBR/BSP/Ss555
> > > > >>
> > > > >> but i dont know how to configure the external RAM just
> > > after the
> > > > >> internal RAM in memory?
> > > > >> hope you could give me some guide!
> > > > >>
> > > > >>
> > > > >
> > > > > Hello Jython,
> > > > >
> > > > > the documentation you linked is for an MPC. But your
> > subject
> > > line
> > > > > mentions an STM32. What controller / BSP are you using?
> > > > >
> > > > > Best regards
> > > > >
> > > > > Christian Mauderer
> > > > > --
> > > > > --------------------------------------------
> > > > > embedded brains GmbH
> > > > > Herr Christian Mauderer
> > > > > Dornierstr. 4
> > > > > D-82178 Puchheim
> > > > > Germany
> > > > > email: christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>>
> > > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>>>
> > > > > Phone: +49-89-18 94 741 - 18
> > > > > Fax: +49-89-18 94 741 - 08
> > > > > PGP: Public key available on request.
> > > > >
> > > > > Diese Nachricht ist keine geschäftliche Mitteilung im
> > Sinne
> > > des EHUG.
> > > > > _______________________________________________
> > > > > users mailing list
> > > > > users at rtems.org <mailto:users at rtems.org>
> > <mailto:users at rtems.org <mailto:users at rtems.org>>
> > > <mailto:users at rtems.org <mailto:users at rtems.org>
> > <mailto:users at rtems.org <mailto:users at rtems.org>>>
> > > > > http://lists.rtems.org/mailman/listinfo/users
> > > >
> > > >
> > > > _______________________________________________
> > > > users mailing list
> > > > users at rtems.org <mailto:users at rtems.org>
> > <mailto:users at rtems.org <mailto:users at rtems.org>>
> > > > http://lists.rtems.org/mailman/listinfo/users
> > > >
> > >
> > > --
> > > --------------------------------------------
> > > embedded brains GmbH
> > > Herr Christian Mauderer
> > > Dornierstr. 4
> > > D-82178 Puchheim
> > > Germany
> > > email: christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > > <mailto:christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>>
> > > Phone: +49-89-18 94 741 - 18
> > > Fax: +49-89-18 94 741 - 08
> > > PGP: Public key available on request.
> > >
> > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne
> > des EHUG.
> > >
> >
> > --
> > --------------------------------------------
> > embedded brains GmbH
> > Herr Christian Mauderer
> > Dornierstr. 4
> > D-82178 Puchheim
> > Germany
> > email: christian.mauderer at embedded-brains.de
> > <mailto:christian.mauderer at embedded-brains.de>
> > Phone: +49-89-18 94 741 - 18
> > Fax: +49-89-18 94 741 - 08
> > PGP: Public key available on request.
> >
> > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
> >
>
> --
> --------------------------------------------
> embedded brains GmbH
> Herr Christian Mauderer
> Dornierstr. 4
> D-82178 Puchheim
> Germany
> email: christian.mauderer at embedded-brains.de
> Phone: +49-89-18 94 741 - 18
> Fax: +49-89-18 94 741 - 08
> PGP: Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.rtems.org/pipermail/users/attachments/20190618/58e3c9e4/attachment-0001.html>
More information about the users
mailing list