Re: Attempting to install on RPi4B w/ UEFI, having some problems

> it might just be the kernel switching from serial console to video output for the system console

There is a boot flag, -D I think, for forcing dual output to video + serial.

> Any idea about debugging this further?

My advice for this kind of problem: get a JTAG. Can be yours for 25 USD and will give you a debugger at the hardware level (single step instructions, inspection of memory addresses, setting breakpoints etc). Bit time consuming to set up though.

— RHC.

On Fri, Sep 11, 2020 at 15:01, Robert Clausecker <[email protected]> wrote:

> On Fri, Sep 11, 2020 at 01:56:10PM +0000, [email protected] wrote:
>> September 11, 2020 2:42 PM, "Robert Clausecker" <[email protected]> wrote:
>>
>> >> On 2020-Sep-10, at 13:11, Robert Clausecker <fuz at fuz.su> wrote:
>> >> FYI: I use GPT partitioning. (No claim that you need to.)
>> >
>> > Ah, good to know that that works. I was afraid the UEFI code
>> > required an MBR scheme as the documentation indicated such.
>>
>> EDK2 UEFI not supporting GPT would be *very* weird.
>> I'm pretty sure the documentation was referring to the RPi early firmware.
>
> Possible. I may check this later tonight. The main thing is that the
> RPi4 firmware must be able to load UEFI's start4.elf from the EFI partition
> within a GPT partition table. Not sure if it can do that.
>
>> Maybe the update that added pure-USB boot added GPT support there as well!
>>
>> > But it appears that loading the DTB from the UEFI boot loader is not
>> > supported at all. In fact, when I configure UEFI to generate a DTB
>> > only (ACPI off), the kernel hangs during boot.
>>
>> Well that might be a FreeBSD side problem.
>
> Possibly. I'm not entirely sure if it's really a kernel hang; some other
> users suggested it might just be the kernel switching from serial console to
> video output for the system console (it does stay at the serial console when
> using ACPI). I can't really tell as I don't have a way to attach a screen
> ATM. Any idea about debugging this further?
>
> Yours,
> Robert Clausecker
>
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