On 12/03/18 17:33, Amit Tomer wrote:


This is quite useful to get output without any serial driver. I am quite
impressed you managed to debug your serial driver without it :).

Actually,  we have earlycon=xenboot(suggested by Andre) enabled in
Dom0 bootargs and it allowed us to
debug XEN boot further.

I am wondering if ealycon interface can be used in absence of > earlyprintk 
doing same work?

earlycon=xenboot enables the early console for the hardware domain only. What I meant is having earlyprintk for Xen (see CONFIG_EARLY_PRINTK). This is used for low-level debug when booting the hypervisor.


Julien Grall

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