On 4/4/2014 1:15 PM, Gedare Bloom wrote: > The license looked fine to me. +1
As always, we just need to be careful on a file per file basis just in case something else in rpi-boot has a different license. > 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 >> > _______________________________________________ > rtems-devel mailing list > rtems-devel@rtems.org > http://www.rtems.org/mailman/listinfo/rtems-devel -- Joel Sherrill, Ph.D. Director of Research & Development joel.sherr...@oarcorp.com On-Line Applications Research Ask me about RTEMS: a free RTOS Huntsville AL 35805 Support Available (256) 722-9985 _______________________________________________ rtems-devel mailing list rtems-devel@rtems.org http://www.rtems.org/mailman/listinfo/rtems-devel
