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how enable kernel show booting log(allwinner H6)

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I met a problem that kernel showed allwiner H6 ethernet internal error. link:

 

It is hard to loacate what makes that error occur, I wish that kernel can show my log added to drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c.  my work below:

 

1 Added printk to drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c, and made patch with git format-patch, move patch to userpatchs/kernel/sunxi-next.

 

2 run ./compile.sh to compile armbian, I am sure that patch work,  have checked drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c after compile.sh completion

 

3 burn Armbian_5.71_Orangepioneplus_Ubuntu_bionic_next_4.19.13_desktop.img to sdcard, inserted sdcard in H6 board and boot

 

The ethernet internal error log showed but the rest part not

 

How to enable kernel show booting log?  Any answer would be appriciated. Thanks a lot.

 

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