Early boot output over serial - orange pi zero

[darkdrgn2k]

The current orange pi build does not output anything to serial after "Starting kernel ..."

After poking at it i found the issue is probably in zImage
replacing the stock zImage from Armbian yields

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

[hamishcoleman]

Are you saying that the current build crashes before finishing booting, or that there are messages not seen on the output?

I built an image from v0.6-91-gb352b7972309 and had no issues (there is a significant delay between "starting kernel" and the next line - as usual)

Starting kernel ...

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.13.0 (hamish@x230i5) (gcc version 6.3.0 20170516 (Debian 6.3.0-18)) #25 SMP Tue Sep 12 14:03:50 HKT 2017


[darkdrgn2k]

You are correct

In armbian there are a few more lines between starting kernel and 0.0000

They are not important unless you have issues with initrd. The early error messages will not show

Not a huge bug.. Just though is document that I isolated it to zImage (using armbian zImage produces the missing output)

[hamishcoleman]

ah, in this case it is a simple one: Its a kernel config option to set the amount of messages on the output add the kernel cmdline param "loglevel=7" and you should see some extra messages.

I added that setting into the kernel config to go into the next kernel build.