doc looks good
On Thu, Mar 25, 2021 at 2:36 AM Christian Mauderer <christian.maude...@embedded-brains.de> wrote: > > --- > user/bsps/arm/stm32h7.rst | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/user/bsps/arm/stm32h7.rst b/user/bsps/arm/stm32h7.rst > index 3eee511..483d029 100644 > --- a/user/bsps/arm/stm32h7.rst > +++ b/user/bsps/arm/stm32h7.rst > @@ -31,3 +31,29 @@ USB Host Driver > --------------- > > The USB host driver ``dwc_otg`` is provided by the ``libbsd``. > + > +SD/MMC Driver > +------------- > + > +The SDMMC driver ``st_sdmmc`` is provided by the ``libbsd``. > + > +The default initialization is done for the STM32H743I-EVAL 2 board. > + > +To use different pins, you can create a ``HAL_SD_MspInit()`` function in your > +application that overwrites the default one defined in ``RTEMS``. If you > don't > +have direction lines like on the evaluation board, you can just skip > +initializing these pins. > + > +If you want to use a different number of data lines, another polarity for the > +data direction pins, a different voltage or similar, you have to redefine > +``st_sdmmc_get_config()`` (normally provided by ``libbsd``) in your > application. > + > +Known limitations: > + > +* Currently 1.8V signaling is not implemented. Therefore higher speeds like > used > + for UHS cards are not available. All cards fall back to High Speed > transfers. > +* The driver uses the IDMA only. MDMA is currently not implemented. For > SDMMC1 > + that means that the memory buffers can only come from AXI SRAM, QSPI > memory, > + Flash or the FMC (SDRAM, ...). The internal SRAM1, SRAM2, SRAM3 and SRAM4 > is > + not supported. SDMMC2 should not have that limitation. See ST AN5200 > "Getting > + started with STM32H7 Series SDMMC host controller" for more details. > -- > 2.26.2 > > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel