Other Parts Discussed in Thread: AM3894
We’re using u-boot to boot (from SD card) a custom-designed AM3894 board driving a custom designed 1080p screen which is single-mode i.e. it will only lock/sync to a 1080p signal.We’re driving our screen system from the on-chip HDMI port. We want to have a boot splash screen, but u-boot as it is only seems to configure the VPSS and HDMI to 720p for the boot splash screen, which our screen system can’t lock to or display properly. Looking at the sources, we noticed in the file
u-boot/include/logo.h
the line
#define CONFIG_720P
which in the same file is used to set WIDTH and HEIGHT macros. If neither CONFIG_720P, or CONFIG_480P, are defined, WIDTH and HEIGHT are defined as 1920 and 1080, so commenting out
#define CONFIG_720P
looks like it should give us what we want. We tried this and rebuilt u-boot, but it still doesn’t work, although the display does change, and the VPSS fails to.come up and eventually halts the boot.
It seems probable that other changes are needed in setting up the VPSS and HDMI subsystems: can anyone point us to documentation on this or offer any assistance?
We’re using u-boot sources from:
ti-ezsdk_dm816x-evm_5_04_00_11
which is
u-boot-2010.06-psp04.04.00.01
Any replies much appreciated..