Re: [Buildroot] [PATCH v5 0/2] Add board support for the BeagleV-Ahead

From: Kilian Zinnecker via buildroot <buildroot@buildroot.org>
To: buildroot@buildroot.org, Drew Fustini <dfustini@tenstorrent.com>
Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>,
	Revy <rabenda.cn@gmail.com>,
	robertcnelson@beagleboard.org, jkridner@beagleboard.org,
	Drew Fustini <drew@beagleboard.org>
Subject: Re: [Buildroot] [PATCH v5 0/2] Add board support for the BeagleV-Ahead
Date: Wed, 01 Jan 2025 21:00:54 +0100	[thread overview]
Message-ID: <2292259.iZASKD2KPV@kilian-laptop> (raw)
In-Reply-To: <Z3WcIOKr8jnCUVCY@x1>

Hello Drew,

[--SNIP--]

> > I think that u-boot is the ideal solution since that is the direction
> > that T-Head decided to go. I asked Revy on Telegram [1] and they showed
> > me where in thead-u-boot [2] that reset_sample() is called.
> > 
> > Revy pointed me to a build of u-boot-with-spl-beagle.bin [3] that I've
> > just flashed to my Ahead [4]. Unfortunately, there is an issue that
> > results in the board not booting [5]. Revy is going to look into the
> > issue and get back to me.
[--SNIP--]
> 
> Revy just replied that I should be trying mainline OpenSBI. I have to go
> offline for awhile but I will try that later today.

I actually didn't wait and acutally already tried the revyos uboot and it 
seems to work with kernel 6.12.7 and OpenSBI 1.6. I now get:

[    0.113565] smp: Bringing up secondary CPUs ...
[    0.121700] smp: Brought up 1 node, 4 CPUs
[--SNIP--]
[    0.216965] cpuidle: using governor menu
[    0.251283] cpu3: Ratio of byte access time to unaligned word access is 
6.14, unaligned accesses are fast
[    0.251283] cpu2: Ratio of byte access time to unaligned word access is 
6.14, unaligned accesses are fast
[    0.251284] cpu1: Ratio of byte access time to unaligned word access is 
6.14, unaligned accesses are fast
[    0.303594] cpu0: Ratio of byte access time to unaligned word access is 
6.14, unaligned accesses are fast

So I think all cores are up and running now! :D Thanks for all the help so 
far! I still have some questions though and there are still some things to do. 
However, I will send a v6 of the patches, although they are still not ready to 
get accepted.

Regarding the revyos boot, I have two questions:

1) Are the xuantie binary blobs still needed? The light_aon_fpga.bin and the 
light_c906_audio.bin?

2) The revyos uboot seems to also need the reset-sampe device tree node. I 
therefore added it via a custom device tree. However I still get the error 
message "## fdt has no reset_sample". Any idea, what could be wrong here?

https://github.com/revyos/thead-u-boot/blob/th1520/arch/riscv/lib/bootm.c#L115

Thanks and best regards,
Kilian

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