I having problems with the video bootargs in U-boot. One set of parameters will work with some demos/workshop_examples, but not all of them.
I havent found any good documentation on which parameters to use or why.
The closest resource I've found is the link below. I'm using a Davinci EVM DM6446, with the latest kernal and packages for DVSDK_2_0_0_22.
I've re-built most packages. The u-boot params are set for TFTP kernal, NFS filesys
http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/99/p/6196/23269.aspx#23269
;JH - this, puts up a green haze and doesn't work with EVM demos
; this will work with the workshop example lab07_osd_setup
; sendln 'setenv videocfg video=davincifb:osd0=720x480x16,1350K:osd1=720x480,1350K:vid0=720x480,2025K:vid1=720x480,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=NTSC'
;JH - this works for SWANN monitor - evm demos
; sendln 'setenv videocfg video=davincifb:vid0=0,2500K:vid1=0,2500K:osd0=720x576x16,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=ntsc'
;JH - this causes demos to not function correctly
; sendln 'setenv videocfg video=davincifb:vid0=720x576x16,2500K:vid1=720x576x16,2500K:osd0=720x576x16,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=NTSC'
;JH - not working for video_record workshop
;sendln 'setenv videocfg video=davincifb:osd0=720x480x16,1350K:osd1=720x480x16,1350K:vid0=720x480x16,2025K:vid1=720x480x16,2025K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=NTSC'
;JH - this did not work either
;sendln 'setenv videocfg video=davincifb:osd0=720x480x16,2025K:osd1=720x480,2025K:vid0=0,2500K:vid1=0,2500K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=NTSC'
;JH - not working with workshop video record example, works with evm demos
sendln 'setenv videocfg video=davincifb:osd0=720x576x16,2025K:vid0=0,2500K:vid1=0,2500K davinci_enc_mngr.ch0_output=COMPOSITE davinci_enc_mngr.ch0_mode=NTSC'