Re: [PATCH v2 0/2] Add macb support for SiFive FU540-C000
From: Troy Benjegerdes
Date: Mon Jun 17 2019 - 10:19:23 EST
> On Jun 17, 2019, at 6:34 AM, Paul Walmsley <paul.walmsley@xxxxxxxxxx> wrote:
> On Mon, 17 Jun 2019, Andreas Schwab wrote:
>> On Jun 17 2019, Paul Walmsley <paul.walmsley@xxxxxxxxxx> wrote:
>>> On Mon, 17 Jun 2019, Andreas Schwab wrote:
>>>> On Jun 17 2019, Paul Walmsley <paul.walmsley@xxxxxxxxxx> wrote:
>>>>> Looks to me that it shouldn't have an impact unless the DT string is
>>>>> present, and even then, the impact might simply be that the MACB driver
>>>>> may not work?
>>>> If the macb driver doesn't work you have an unusable system, of course.
>> Because a system is useless without network.
> From an upstream Linux point of view, Yash's patches should be an
> improvement over the current mainline kernel situation, since there's
> currently no upstream support for the (SiFive-specific) TX clock switch
> register. With the right DT data, and a bootloader that handles the PHY
> reset, I think networking should work after his patches are upstream --
> although I myself haven't tried this yet.
Have we documented this tx clock switch register in something with a
direct URL link (rather than a PDF)?
Iâd like to update freedom-u-sdk (or yocto) to create bootable images
with a working U-boot (upstream or not, I donât care, as long as it works),
and what I have right now is the old legacy HiFive U-boot and a 4.19
kernel with a bunch of extra patches.
The legacy M-mode U-boot handles the phy reset already, and Iâve been
able to load upstream S-mode uboot as a payload via TFTP, and then
load and boot a 4.19 kernel.
It would be nice to get this all working with 5.x, however there are still
several missing pieces to really have it work well.