The license looked fine to me. On Thu, Apr 3, 2014 at 10:06 PM, Alan Cudmore <alan.cudm...@gmail.com> wrote: > From my limited research, it looks like the emmc controller in the Raspberry > Pi BCM2835 may be the way to go. > It looks like it is a high level controller for the SD/MMC card slot on the > Pi. > > Since this is a custom controller, I don't think there would be an existing > driver in RTEMS. > > It seems that this emmc controller in the Pi may handle different types of > cards, and at a higher level than just using the SPI bus to access the card. > ( This is based on some searches of conversations on the raspberry pi forums > , not my experience ) > > You would have to write a driver for this emmc controller and provide the > interface to libblock for the file system interface on RTEMS. The code you > have linked above for rpi-boot looks like it has a permissive license, so it > *may* be possible to use this code in the RTEMS driver. There is some other > potentially useful code in there too. > > I'll have to try the serial bootloader, I am also close to ordering an > inexpensive JTAG adapter to try loading and debugging through JTAG. uboot is > another possibility, using a TFTP server. > > Alan > > > > > On Wed, Apr 2, 2014 at 12:02 PM, Andre Marques > <andre.lousa.marq...@gmail.com> wrote: >> >> Hello, >> >> I'm intending to work in the SD card support for the Raspberry Pi BSP, >> using the SD mode instead of the SPI mode. >> >> The references I have gathered so far for this are as follows: >> >> The Raspberry Pi SOC guide: Broadcom BCM2835 Peripherals Guide (Chapter 5 >> - EMMC) >> >> The simplified SD standard - >> https://www.sdcard.org/downloads/pls/simplified_specs/ >> >> And the following github code - >> https://github.com/jncronin/rpi-boot/blob/master/emmc.c >> >> There is also the libchip/i2c/spi-sd-card libi2c driver, which can also be >> a reference (even though it uses SPI). >> >> Now, the questions: >> >> Should I use the Generic Disk Device driver, as the >> libchip/i2c/spi-sd-card ? >> >> Is there any driver using the SD mode for sd card access, or using an emmc >> interface currently in the RTEMS code base? I haven't found any. >> >> On a side note, I managed to send RTEMS applications to the RPi though the >> UART interface using the xmodem protocol. >> >> For that I used the following bootloader >> >> https://github.com/dwelch67/raspberrypi/tree/master/bootloader05 >> >> It takes me 2 minutes to send 1 MB of data to the RPi, but this could be >> improved if it used 1024 byte block transfer instead of the default of 128. >> The bootloader loads the transfered program to memory and runs it. Then the >> RPi must be rebooted so a new program can be sent. >> >> It may not be the best way, but only requires an usb-to-uart cable, and >> avoids the current SD card "dance" to run programs on the Pi. >> >> Thank you for your time. >> >> --André Marques >> >> > > > _______________________________________________ > rtems-devel mailing list > rtems-devel@rtems.org > http://www.rtems.org/mailman/listinfo/rtems-devel >
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