I assume loading the firmware via Linux first won't help since a PCIe reset
probably also
resets the USB controller.
However, I just checked Richard's kernel source and it seems the firmware
loading functionality
is already included, there is a call to
xhcireset(BUSBNO(hp->tbdf)<<20 | BUSDNO(hp->tbdf)<<15 |
BUSFNO(hp->tbdf)<<12);
in http://9p.io/sources/contrib/miller/9/bcm/usbxhci.c
The comment for xhcireset in http://9p.io/sources/contrib/miller/9/bcm/vcore.c
confirms this:
/*
* Notify gpu that xhci firmware might need loading. This is for some
* pi4 board versions which are missing the eeprom chip for the vl805,
* requiring its firmware to come from the boot eeprom instead.
*/
It seems that this source code is more recent than the images for the SD card
and kernel in
http://9p.io/sources/contrib/miller/ - I'll try building a kernel based on the
updated sources.
- Michael
> On 15 Jan 2021, at 23:32, Bakul Shah <ba...@iitbombay.org> wrote:
>
> Can you netboot Linux followed by netbooting Paln9 and have a working USB?
>
>> On Jan 15, 2021, at 1:17 PM, Michael Engel <michael.en...@ntnu.no> wrote:
>>
>> Hi,
>>
>> I didn't test Plan 9 on my RPi 400 so far, but I think the reason for the
>> USB problems
>> is the following:
>>
>> The Raspberry Pi 400 (along with the Compute Module 4 and the 8 GB RAM
>> version
>> of the RPI4) uses a new stepping C0 of the BCM2711. This version does not
>> have a
>> dedicated EEPROM for the firmware of the xHCI USB controller and needs an
>> additional property mailbox call for loading the xHCI firmware after PCIe
>> reset.
>>
>> Some code to load the firmware can be found in the circle bare-metal library
>> (l. 88ff):
>> https://github.com/rsta2/circle/blob/Step42.1/lib/usb/xhcidevice.cpp
>>
>> -- Michael
>>
>>
>>> On 15 Jan 2021, at 20:54, Mack Wallace <mac...@mapinternet.com> wrote:
>>>
>>> I took that microSD card that has the bootable image without USB and put it
>>> into a traditional Pi4. It boots on that without a problem and has mouse
>>> and keyboard. I notices that after the additional CPU cores are detected,
>>> that is mentions usb/hub… usb/kbd…. The image when booting on the Pi 400
>>> never provides those messages.
>>>
>>> Regards,
>>>
>>> Mack
>>>
>>>> On Jan 15, 2021, at 1:44 PM, Mack Wallace <mac...@mapinternet.com> wrote:
>>>>
>>>> Dear Skip,
>>>>
>>>> That pushed the ball forward significantly, but I still have issues. (But
>>>> thank you, every little advancement helps.) So with that flag, I was able
>>>> to get Richard’s port to boot into Glenda’s account (showing acme, faces,
>>>> stats, etc). However, I do not seem to have any USB; no mouse; nor
>>>> keyboard. Stats is moving on the screen, so things are not too locked up.
>>>> I did try rebooting with an external keyboard and another mouse. Still
>>>> nothing. The external keyboard doesn’t respond to anything (no caps lock
>>>> nor num lock.) One mouse is in the USB 2.0 port, another and the external
>>>> keyboard are in the USB 3.0 ports.
>>>>
>>>> on boot, I see the following:
>>>> usbxhci: 0x1106 0x3483 port 600000000 size 0x1000 irq0
>>>> #u/usb/ep1.0: xhci port 0x0 irq 0
>>>>
>>>> The line before is #l for the network,
>>>> The line after is the detection of the other three cores.
>>>>
>>>> The changing of the enable_gic=1 on the 9front image seemed to have to
>>>> effect.
>>>>
>>>> Thanks again!
>>>>
>>>> Mack
>>>>
>>>>
>>>> On Jan 14, 2021, at 8:15 PM, Skip Tavakkolian <skip.tavakkol...@gmail.com>
>>>> wrote:
>>>>>
>>>>> I'm using a RPi400 with Richard's port. I'm netbooting without issues and
>>>>> up for days. The only issue I had was forgetting to set 'enable_gic=1'
>>>>> as Richard instructed in the sources. Pi4 works ok without it, pi400
>>>>> doesn't.
>>>>>
>>>>>
>>>>> On Thu, Jan 14, 2021, 3:39 PM Mack Wallace <mac...@mapinternet.com> wrote:
>>>>> Thank you for the reply Stuart, but no luck.
>>>>>
>>>>> I did download Mr. Miller’s image. It would not boot at all until I
>>>>> replaced the files that you mention, but the kernel in that image locks
>>>>> up after detecting the fourth core of the CPU. However, from that failure
>>>>> I learned that those files, (start_cd.elf, start4cd.elf, fixup_cd.dat,
>>>>> fixup4cd.dat) are necessary for the Pi to boot, and that those with the
>>>>> bootcode.bin and presumably, but it doesn’t seem to matter whether I use
>>>>> bcm2711-rpi-4-b.dtb or bcm2711-rpi-400.dtb - the dtbs are vital to the
>>>>> process. - and that all those files simply need to be copied into the fat
>>>>> partition/boot directory.
>>>>>
>>>>> So I burned another image (actually many, trying different SD cards, and
>>>>> different configurations, older kernels, etc) and replaced all the files
>>>>> I’ve mentioned with the ones from
>>>>> https://github.com/raspberrypi/firmware/tree/master/boot (hopefully
>>>>> that’s where I should get them). My most recent iteration just has the
>>>>> single error repeated:
>>>>>
>>>>> sdhc: read error intr 2008002 stat 1fff0000
>>>>>
>>>>> This occurs many times. In the middle of these errors is
>>>>>
>>>>> /dev/sdM0: BCM SD Host Controller 02 Version 10
>>>>>
>>>>> then the error repeats itself over 50 times before printing out the lines
>>>>> /dev/sdM0/data
>>>>> bootargs is (tcp, tls, il, local!device)[]
>>>>>
>>>>> At no time during this process is the keyboard or mouse responsive.
>>>>> Though the mouse icon did become visible during the boot process.
>>>>>
>>>>> I am hoping I am wrong, but I am thinking there is some sort of driver
>>>>> issue. At the very least, checking what media there is to mount, or
>>>>> reading the SD card. And then possibly for other things, but the former
>>>>> could be gumming up the works for everything else.
>>>>>
>>>>>
>>>>>> On Jan 14, 2021, at 6:05 PM, Stuart Morrow <morrow.stu...@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>> Try copying the .dtb *and* the start4 and fixup4.
>>>
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