On Tue, Dec 18, 2018 at 04:26:10AM +0100, Roland Hieber wrote: > On Mon, Dec 17, 2018 at 09:10:40AM +0100, Rouven Czerwinski wrote: > > The miniuart uses the core clock as the clock source. This clock is fixed by the > > firmware to 250Mhz if enable_uart=1 is set in the config.txt file. > > However a user could still choose to overclock the core frequency, > > which would result in wrong baudrates computed by barebox. > > Retrieve the core clock frequency from the firmware to allow all potential > > firmware configurations to work with barebox. > > > > Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx> > > --- > > arch/arm/boards/raspberry-pi/rpi-common.c | 7 +++++++ > > 1 file changed, 7 insertions(+) > > > > diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c > > index 490aeef..e29177d 100644 > > --- a/arch/arm/boards/raspberry-pi/rpi-common.c > > +++ b/arch/arm/boards/raspberry-pi/rpi-common.c > > @@ -309,6 +309,13 @@ static int rpi_console_clock_init(void) > > clkdev_add_physbase(clk, 0x20201000, NULL); > > clkdev_add_physbase(clk, 0x3f201000, NULL); > > > > + clk = rpi_register_firmware_clock(BCM2835_MBOX_CLOCK_ID_CORE, > > + "uart1-8250"); > > + if (IS_ERR(clk)) > > + return PTR_ERR(clk); > > + > > + clkdev_add_physbase(clk, 0x3f215040, NULL); > > This magic value could probably have an explaining comment somewhere > next to it. Or better a #define BCM2835_xxx_BASE 0x3f215040. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
