Dear all,
These are the changes required to get Raspberry Pi CM3 to boot from the
built-in MMC flash chip. With these patches applied, Barebox successfully boots
a Raspbian system using the following commands:
global linux.bootargs.base="earlyprintk console=tty0 console=ttyAMA0,115200
root=/dev/mmcblk0p2 rootfstype=ext4 rootwait noinitrd"
bootm -o /boot/bcm2710-rpi-cm3.dtb /boot/kernel7.img
Overview of the changes:
- Implemented pinctrl driver hooks for BCM2835 GPIO, so that pinctrl-
directives in the device tree are honored.
- Added the missing device tree property parsing to mci-bcm2835 driver.
- Added a new Kconfig setting for the Compute Module 3 since a slightly
different device tree is required compared to Raspberry Pi 3.
Slightly ugly parts:
- pinctrl needs to be initialized before mci. The only way I found to do this
is to change the link order, since mci is already started early using
coredevice_initcall().
- having a separate MACH_RPI_CM3 in addition to MACH_RPI3 seems an overkill,
but I couldn't find a clean way to just have a different device tree.
Best regards
Tomaz
Tomaz Solc (7):
ARM: rpi: switch emmc from sdhost to sdhci
Kconfig: add pin controllers submenu.
pinctrl: bcm2835: move existing code from gpio.
pinctrl: bcm2835: register the pin controller.
mci: move after pinctrl in link order.
mci: bcm2835: parse other device tree properties.
ARM: rpi: Add device tree for Compute Module 3.
arch/arm/boards/raspberry-pi/lowlevel.c | 10 +++++
arch/arm/configs/rpi_defconfig | 2 +-
arch/arm/dts/Makefile | 1 +
arch/arm/dts/bcm2837-rpi-3.dts | 9 ++++
arch/arm/dts/bcm2837-rpi-cm3.dts | 26 +++++++++++
arch/arm/mach-bcm283x/Kconfig | 6 +++
drivers/Makefile | 2 +-
drivers/gpio/Kconfig | 4 --
drivers/gpio/Makefile | 1 -
drivers/mci/mci-bcm2835.c | 3 ++
drivers/pinctrl/Kconfig | 10 +++++
drivers/pinctrl/Makefile | 1 +
.../gpio-bcm2835.c => pinctrl/pinctrl-bcm2835.c} | 52 +++++++++++++++++++++-
images/Makefile.bcm283x | 6 ++-
14 files changed, 124 insertions(+), 9 deletions(-)
create mode 100644 arch/arm/dts/bcm2837-rpi-cm3.dts
rename drivers/{gpio/gpio-bcm2835.c => pinctrl/pinctrl-bcm2835.c} (77%)
--
2.11.0
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