Pinebook Pro, any progress as of yet ?

[Emmanuel Vadot]

On Thu, 2 Jan 2020 19:53:40 +0100
Søren Schmidt <soren.schmidt at gmail.com> wrote:

> 
> On 1 Jan 2020, at 15.24, Emmanuel Vadot <manu at bidouilliste.com> wrote:
> 
> >> 
> >>> I know have something that can be booted correctly and with usb.
> >>> U-Boot is the same but I've switched the uart baudrate to 115200 as
> >>> it's way too noisy at 1.5Mbps for me
> 
> I found a way to make it work reliably, the wires from the USB<>serial converter needs to be short (se pic) then it works without issues at 1.5Mbaud
> If I use the 1meter long cable from my usual adapter it fails just as you noticed.
> 

 Not for me, even on the mainboard after the mux it's too noisy :
https://people.freebsd.org/~manu/pbp_uart.jpeg
 Channel 2 is at the end of the cable while channel 3 is on the
mainboard connector (after the mux).

> > The boot order is fixed and is SPI->eMMC->SD
> > So if a bootloader exists on the eMMC it will boot from it.
> > The u-boot installed will try to boot from the sdcard using u-boot
> > distro boot mechanism but it will not work for us as EFI is broken on
> > it. (It might work if you use kernel.bin and compile it with
> > LINUX_BOOT_ABI).
> 
> I got it to boot by having a fat32 partition with just the kernel and a /extlinux/extlinux.conf file on it, then it boots just fine.
> It see the eMMC and the SD-card so it should be able to get to a shell at least, need to get my build script finished.
> 
> I?ll check your patches from GitHub and get it integrated so the ball can start rolling :)
> 
> Thanks for getting us this far!!
> 
> -Søren

-- 
Emmanuel Vadot <manu at bidouilliste.com>