Hi Stephen,
On Sat, 6 Feb 2016 10:42:43 -0700 Stephen Warren swarren@wwwdotorg.org wrote:
The FB address is generated by the firmware running on the GPU/VideoCore and is a "bus" address. This address is the other side of an IOMMU from the ARM upon which U-Boot is running. Use bus_to_phys() to convert this to an ARM physical address. Without this, U-Boot seems to work just fine, but once the Linux kernel boots on an RPi2, accessing the FB memory often causes a hard system hang.
This is related to: 122426d46e31 ARM: bcm2835: use phys_to_bus() for mbox 5c0beb5c58c8 usb: dwc2: use phys_to_bus/bus_to_phys 79340db7f1f6 ARM: bcm2835: implement phys_to_bus/bus_to_phys
Signed-off-by: Stephen Warren swarren@wwwdotorg.org
drivers/video/bcm2835.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
applied to u-boot-video/master, thanks!
-- Anatolij