On Thu, Sep 30, 2021 at 8:03 AM Bertrand Marquis <[email protected]> wrote:
> Hi Luca, > > > On 30 Sep 2021, at 15:54, Luca Fancellu <[email protected]> wrote: > > > > The mmc probing order has become unpredictable > > due to recent linux kernel changes, therefore devices > > like the raspberry pi that have two mmc interface most > > of the time can't boot from the hard-coded root path. > > > > Modify the u-boot script to fetch the PARTUUID of the > > second partition of the sd card and use it to put > > root=PARTUUID=<xxx> in the command line passed to > > the dom0 kernel. > Thanks for posting a way of handling this. I've encountered the same unpredictable device enumeration and had been looking into whether switching the sdhci_iproc driver to PROBE_FORCE_SYNCHRONOUS instead of PROBE_PREFER_ASYNCHRONOUS would resolve it but I can't report that it does. I would prefer to have a way to get stable enumeration but without it, this is an improvement. > > > > Signed-off-by: Luca Fancellu <[email protected]> > > Reviewed-by: Diego Sueiro <[email protected]> > > Reviewed-by: Bertrand Marquis <[email protected]> > Reviewed-by: Christopher Clark <[email protected]> Tested-by: Christopher Clark <[email protected]> Christopher > > Cheers > Bertrand > > > --- > > .../xen-rpi-u-boot-scr/files/boot.cmd.xen.in | 11 +++++++---- > > 1 file changed, 7 insertions(+), 4 deletions(-) > > > > diff --git > a/dynamic-layers/raspberrypi/recipes-bsp/xen-rpi-u-boot-scr/files/ > boot.cmd.xen.in > b/dynamic-layers/raspberrypi/recipes-bsp/xen-rpi-u-boot-scr/files/ > boot.cmd.xen.in > > index 0367e36..9874220 100644 > > --- a/dynamic-layers/raspberrypi/recipes-bsp/xen-rpi-u-boot-scr/files/ > boot.cmd.xen.in > > +++ b/dynamic-layers/raspberrypi/recipes-bsp/xen-rpi-u-boot-scr/files/ > boot.cmd.xen.in > > @@ -13,10 +13,6 @@ fdt resize 0x1000 > > echo Add boot arguments for Xen > > fdt set /chosen xen,xen-bootargs "console=dtuart > dtuart=/soc/serial@7e215040 dom0_mem='@@RPI_DOM0_MEM@@' > @@RPI_DEBUG_XEN_ARGS@@" > > > > -echo Add boot arguments for dom0 > > -setenv dom0_bootargs "console=hvc0 earlycon=xenboot debug > root=/dev/mmcblk0p2 rootwait" > > -fdt set /chosen xen,dom0-bootargs \"${dom0_bootargs}\" > > - > > echo Add a dom0 node to chosen to put Linux boot information in > > fdt mknode /chosen dom0 > > > > @@ -32,6 +28,13 @@ fdt rm /scb/pcie@7d500000/pci@1,0/usb@1,0 > > echo Delay to allow the MMC card to be ready > > sleep 1 > > > > +# Retrieve PARTUUID for the rootfs partition of the sdcard > > +part uuid mmc 1:2 rootfs_partuuid > > + > > +echo Add boot arguments for dom0 > > +setenv dom0_bootargs "console=hvc0 earlycon=xenboot debug > root=PARTUUID=${rootfs_partuuid} rootwait" > > +fdt set /chosen xen,dom0-bootargs \"${dom0_bootargs}\" > > + > > echo Load Xen into memory > > fatload mmc 1:1 ${xen_loadaddr} xen > > echo Xen loaded, size: 0x$filesize > > -- > > 2.17.1 > > > > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > > > >
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