[PATCH 0/7] rockchip: Add boot from USB OTG port

[FUKAUMI Naoki]

Hi Kever Yang,

On 5/8/25 12:43, Kever Yang wrote:
> Hi Arnaud,
> 
> On 2025/5/7 23:31, Arnaud Patard wrote:
>> Hi,
>>
>> On Tue, 2025-05-06 at 15:53 +0800, Kever Yang wrote:
>>> Hi Naoki,
>>>
>>> On 2025/2/11 13:33, FUKAUMI Naoki wrote:
>>>> This patch series adds the ability to boot from the USB OTG port to
>>>> the RK3588, RK3568, RK3566, RK3399, RK3328, and RK3308.
>>>>
>>>> Use rkflashtool[1] or rkusbboot[2]
>>> Does these two tool have the same functionality? I don't know the
>>> second
>>> one :(
>>>
>>> And I know there is another tool named rkdeveloptool from rockchip.
>>>
>>>>    to download TPL and SPL from
>>>> MASKROM mode, and dfu-util to download U-Boot from DFU mode.
>>> What's the main target for this patchset, boot from usb with ramboot
>>> support and without any eMMC/SD/SPI driver?
>>>
>> I can't talk for Naoki, but my use case is to test easily u-boot on my
>> rockchip platforms without having to flash u-boot or to have some
>> storage.
> 
> Yes, I agree the usb boot+RAM boot can help u-boot developers.
> 
> But this function can be done directly in BootRom mode with rockusb 
> protocol;
> 
> or add support for it in U-Boot Proper gadget(rockusb or DFU).

Does this mean I should use rockusb or DFU on U-Boot to test the new U-Boot?

>>> I would prefer to keep using one tool instead of two or more tools,
>>> so I
>>> don't think
>>>
>>> enable DFU in SPL is a good idea, using rockusb in SPL is better
>>> here.
>> To test u-boot, I'd like to use snagflash/snagboot as it's not rockchip
>> specific.
> 
> Two more tools other than rkdeveloptool/rkflashtool/rkusbtool/rockusb :(
> 
> 
>>   So, this means adding support for maskrom (which I've already
>> written) and rockusb protocols to it. With DFU in SPL support in u-
>> boot, this would mean nothing to do as the support for DFU is already
>> in snagboot/snagflash.
> 
> I understand your requirement, but you didn't say why you need SPL DFU.
> 
> There are two modes for usb download in rockchip platform:
> 
> - Maskrom mode (in bootRom), may have speed limit due to bootRom driver 
> setting,
> 
>      for download bootloader including U-Boot which size is not big;
> 
> - Loader mode(in U-Boot), all the speed including CPU, eMMC has promote 
> to performance mode,
> 
>      for download all the big size image including system and userdata.
> 
> Of cause we can add any function to the SPL, and it's simple because it 
> already in U-Boot,
> 
> but do we really need it for all the user and product?
> 
> We should keep the SPL simple and fast, and get into U-Boot proper 
> quickly with full function.

I agree that SPL should be simple and require fewer tools.

Best regards,

--
FUKAUMI Naoki
Radxa Computer (Shenzhen) Co., Ltd.

> Thank,
> - Kever
>>
>> Arnaud
>>
>>
>