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 
> <mailto: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 
>> <mailto: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 
>> <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 
>>> <mailto:morrow.stu...@gmail.com>> wrote:
>>> 
>>> Try copying the .dtb *and* the start4 and fixup4.
>>> 
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