Texas Instruments TMS320DM357 DVEVM v2.05 manual Changing the Video Input/Output Methods, Ntsc

Changing the Video Input/Output Methods

A.1 Changing the Video Input/Output Methods

U-Boot reads the S3 mini-dip switch, position 10 setting on boot-up and stores the results in the videostd environment variable. As long as your U-Boot bootcmd sets the video output using the videostd variable (as the example bootcmds in Section A.4, Alternate Boot Methods do), you can switch between NTSC and PAL by simply changing the S3 switch setting as shown in Section 2.1, Setting Up the Hardware.

To automatically update the bootargs based on the S3 switch setting, please use the following options:

EVM # setenv bootargs 'mem=232M console=ttyS0,115200n8

root=/dev/mtdblock0 rw rootfstype=yaffs2 ip=dhcp video=davincifb:vid0=0,2025K:vid1=0, 1350K:osd0=720x576x16,

2025K davinci_enc_mgr.ch0_output=COMPOSITE

EVM # setenv bootcmd 'setenv setboot setenv bootargs \$(bootargs) davinci_enc_mngr.ch0_mode=\$(videostd);run setboot;nboot 0x80700000 0 0x400000;bootm'

If you do not want to use the videostd variable in your bootcmd, use the following options within your bootargs setting. The difference between the NTSC and PAL settings is shown in bold.

NTSC

video=davincifb:vid0=0,2025K:vid1=0,

1350K:osd0=720x576x16,

2025K davinci_enc_mgr.ch0_output=COMPOSITE davinci_enc_mgr.ch0_mode=ntsc

PAL

video=davincifb:vid0=0,2025K:vid1=0,

1350K:osd0=720x576x16,

2025K davinci_enc_mgr.ch0_output=COMPOSITE davinci_enc_mgr.ch0_mode=pal

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