Re: Sipeed Lichee RV (Allwinner D1)

On 1/19/22 17:24, Mitchell Horne wrote:
>
>
> On 1/17/22 15:02, Jakob Alvermark wrote:
>> Hi,
>>
>>
>> With RISC-V SBCs now coming down in price, I got curios and got 
>> myself a Lichee RV (with the dock).
>>
>> https://linux-sunxi.org/Sipeed_Lichee_RV
>>
>> The instructions here, https://linux-sunxi.org/Allwinner_Nezha along 
>> with some patching got me a working U-boot.
>>
>> Cross-building and putting together and image for and SD card got me 
>> this far:
>>
<snip>
>> Loading kernel...
>> /boot/kernel/kernel text=0x609ddc text=0x133abc data=0xf4420 
>> data=0xb54+0x1d73e4 syms=[0x8+0xcd188+0x8+0xee5ae]
>> Loading configured modules...
>> can't find '/etc/hostid'
>> can't find '/boot/entropy'
>> Using DTB provided by EFI at 0x47ef5000.
>> Kernel entry at 0x56a0002e...
>> Kernel args: (null)
>>
>> -----
>>
>> And here it stops for  ~16 seconds then restarts, that's the watchdog 
>> resetting it.
>>
>> So where do I go from here?
>>
> Hi Jakob,
>
> Looks like it bails somewhere in the initial kernel setup, before the 
> first output to the console. This is a wide range, so it's difficult 
> to say exactly where things are going wrong.
>
> I will say that generally FreeBSD is not expected to work on the D1; 
> as far as I know you are the first to try it. This hardware has some 
> quirks requiring special support, which we are entirely lacking. 
> Specifically, there is one related to virtual memory management, which 
> requires custom (spec-breaking) bits in the page tables to be set, to 
> properly specify the attributes of physical and device memory. This 
> _may_ have something to do with why it is failing where it is. It 
> would take a motivated party to add the support required for this SoC, 
> and I'm not aware of anyone currently taking this on. This board has 
> caused some headaches in Linux-land for the same reasons, but there 
> are more hands to do the work there. I just want to set the 
> expectations properly :)
>
> If you wanted to debug this further, you might rebuild the kernel 
> after adding 'options EARLY_PRINTF' to the config file, as this should 
> enable a couple early outputs and narrow down the search slightly.


Hi Mitchell,


I did not expect it to work. But it would be nice if it did.

I have a long experience with FreeBSD and I have played around with a 
couple of different ARM-boards, but I'm not very experienced with kernel 
hacking.

I built a kernel with EARLY_PRINTF, but it did not give me any more 
output...

Is there anything else I could try?


Jakob