How to setting uboot parameter for HDMI output?

[felixhsu]

Hi All

Platform: i.MX8M-EVK

SW: Linux version 4.9.51-imx_4.9.51_imx8m_ga+g6df7474

An error occurred when adding the HDMI output parameter to the kernel parameter as follows. 

uboot command line:

setenv mmcargs 'setenv bootargs ${bootargs} root=${mmcroot} rootwait rw video=HDMI-A-1:dev=hdmi,1920x1080@59.94,if=RGB24'

error message:

[    1.474509] [drm] parse error at position 30 in video mode 'dev=hdmi,1920x1080@59.94,if=RGB24'

How can I fixed it?

[igorpadykov]

Hi Felix

one can try with Demo Images

https://www.nxp.com/webapp/Download?colCode=L4.9.51_IMX8MQ_GA&appType=license&location=null&Parent_n... 

using attached Release Notes recommendations described in

Table 3. Kernel and device tree configurations:
fsl-imx8mq-evk.dts: for HDMI output
Table 4. Pre-built images :
Combined Boot Image, imx-boot-imx8mqevk-sd.bin-flash_hdmi_spl_uboot
Table 10. Common kernel boot parameters :
video kernel parameter:  1920x1080p60: video=HDMIA-1:1920x1080-32@60

Best regards
igor
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[victoryu · Accepted solution]

The video must be set HDMI-A-1 not HDMIA-1.