RPI4 Install r357606 test 09.02.2020 failed

[bob prohaska]

On Tue, Feb 11, 2020 at 12:18:42AM +0100, Klaus K??chemann wrote:
> 
> 
> 
> Hi Bob, old proud RPI4-owner ;-) ,
> 
[for pedantry's sake, this is a Pi3....]


> according to your request I???ve updated the Wiki (at the bottom) with details
> How you can get back to previous kernel while debugging .
> https://wiki.freebsd.org/arm/Raspberry%20Pi#RPI4
> 

Looks as if the loader path defaults are a little trickier than I realized:

OK 
OK load kernel
/boot/kernel/kernel text=0x987ddc data=0x1905a8 data=0x0+0x79d260 syms=[0x8+0x10bd20+0x8+0x130451]
OK unload kernel
OK load disk0s2:/boot/kernel.spare
don't know how to load module 'disk0s2:/boot/kernel.spare'
OK 

However,
OK load disk0s2:/boot/kernel.spare/kernel
disk0s2:/boot/kernel.spare/kernel text=0x9877bc data=0x1905a8 data=0x0+0x79d260 syms=[0x8+0x10bc60+0x8+0x130430]
worked. Alas, that kernel stops as before, with:
OK load disk0s2:/boot/kernel.spare/kernel
disk0s2:/boot/kernel.spare/kernel text=0x9877bc data=0x1905a8 data=0x0+0x79d260 syms=[0x8+0x10bc60+0x8+0x130430]
OK boot
Using DTB provided by EFI at 0x7ef6000.
EFI framebuffer information:
addr, size     0x3eaf0000, 0x10a800
dimensions     656 x 416
stride         656
masks          0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000

Progress stops at this point.

Looks like the problem is something other than the kernel.
The power supply pins are at 4.88 volts when boot hangs.
That would be within spec for USB (5.0 plus or minus .25
volt) _except_ that the Pi3 is spec'd for 5.1 volts...

That puts me within meter error of undervoltage.

Thanks _very_ much for writing!

bob prohaska