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Author: Ivaylo Dimitrov
To: Tom Rini
CC: Pali Rohár, maemo-leste, u-boot, Merlijn Wajer
Subject: Re: [maemo-leste] [PATCH] arm: Remove nokia_rx51 board

On 15.06.21 г. 15:34 ч., Tom Rini wrote:
> On Tue, Jun 15, 2021 at 08:40:30AM +0300, Ivaylo Dimitrov wrote:
>> Hi,
>> On 22.05.21 г. 0:36 ч., Pali Rohár wrote:
>>> On Friday 21 May 2021 10:44:18 Tom Rini wrote:
>>>> On Wed, May 19, 2021 at 11:52:03AM -0400, Tom Rini wrote:
>>>>> On Wed, May 19, 2021 at 03:27:48PM +0200, Pali Rohár wrote:
>>>>>> On Tuesday 18 May 2021 21:26:40 Tom Rini wrote:
>>>>>>> This board has not been converted to CONFIG_DM_USB by the deadline.
>>>>>>> Remove it.
>>>>>> I'm very disappointed that you want to remove Nokia N900 from U-Boot.
>>>>>> I was waiting waiting half of year because other developers did not
>>>>>> react to issues which were introduced and neither to patches which I
>>>>>> sent (+ trying to remind open issues). And also I was waiting another
>>>>>> half of year until other N900 related patches were merged. So the whole
>>>>>> slowdown was not caused by me, why it is taking so long.
>>>>>> Now there is still one N900 DM related patch waiting for review. I'm
>>>>>> converting code step by step.
>>>>>> So the ball is not on my side.
>>>>> So, what patch(es) need to be applied to get DM_USB enabled? Thanks.
>>>> I don't see any open patches from you that look related to enabling
>>>> DM_USB on the platform. If you want to disable USB on the platform for
>>>> now instead, that's fine too.
>> I tried to migrate the latest master to DM_USB, but unfortunately the
>> results are pretty much sad - adding OF_CONTROL (which is a prerequisite to
>> have DM_USB IIUC) and OF_BOARD (so binary to be compiled), adds ~100k to the
>> size of the u-boot binary, so it becomes 370284 bytes. Given that we have
>> less than 256k of storage space for the u-boot, the produced binary cannot
>> be used on n900 the same way current (no DM_USB) binary is used.
>> As I see it, there are not much options left - u-boot on N900 is not SPL, so
>> we can't use OF_PLATDATA, which in turn always links libfdt.
>> Also, if I read the code (usb-uclass.c) correctly, enabling DM_USB requires
>> the board to be converted to DT and this is way bigger change.
>> Please advice on how to proceed.
> Please post your WIP patches, thanks.

Sorry, I am not sure I understand what patches you want me to post:

WDT patch has already been sent couple of months ago -
Do you want it to be rebased and resend?

DM_USB, I just started writing one and I immediately hit the OF_CONTROL
requirement. Enabling OF_CONTROL requires a full blown migration to DT,
which is a huge task and not really equal to "Please update the board to
use CONFIG_DM_USB...". Without OF_CONTROL, I simply get link failures:

DWARF error: could not find abbrev number 3998
/tmp/cc0BOqms.ltrans0.ltrans.o: in function `usb_child_post_bind':
<artificial>:(.text+0x5672): undefined reference to
<artificial>:(.text+0x568c): undefined reference to
/tmp/cc0BOqms.ltrans0.ltrans.o: in function `usb_scan_device':
<artificial>:(.text+0x6c84): undefined reference to `ofnode_first_subnode'
<artificial>:(.text+0x6c96): undefined reference to `ofnode_read_u32'
<artificial>:(.text+0x6ca4): undefined reference to `ofnode_next_subnode'
undefined reference to `dm_scan_fdt_dev'
undefined reference to `dm_scan_fdt_dev'

Fixing those requires enabling of OF_CONTROL and this in turn means the
board must be migrated to DT, unless I am missing something. That's why
my "please advice..." stance.