On Tue, Oct 8, 2024 at 6:56 PM Simon Glass <s...@chromium.org> wrote: > > Hi Tim, > > On Mon, 7 Oct 2024 at 14:16, Tim Harvey <thar...@gateworks.com> wrote: > > > > Greetings, > > > > I have a need to adjust the U-Boot device-tree live with some board > > revision specific fixups. It would seem I need to enable OF_LIVE to do > > so but when I do this on imx8mm U-Boot proper seems to fail > > phy_connect() called from the network device probe. > > > > The board I'm working with is an imx8mm-venice board and using > > imx8mm_venice_defconfig (without OF_LIVE) results in: > > U-Boot 2024.10-00735-gc530f6079c70 (Oct 07 2024 - 12:58:38 -0700) > > > > CPU: Freescale i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz) > > CPU: Industrial temperature grade (-40C to 105C) at 44C > > Reset cause: POR > > Model: Gateworks Venice GW73xx-0x i.MX8MM Development Kit > > DRAM: 4 GiB > > Core: 226 devices, 32 uclasses, devicetree: separate > > WDT: Started watchdog@30280000 with servicing every 1000ms (60s timeout) > > MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2 > > Loading Environment from MMC... Reading from redundant MMC(2)... OK > > In: serial@30890000 > > Out: serial@30890000 > > Err: serial@30890000 > > SEC0: RNG instantiated > > Net: GPY111 eth0: ethernet@30be0000 [PRIME] > > GSC : boot watchdog disabled > > Thermal protection:enabled at 96C > > Hit any key to stop autoboot: 0 > > > > Yet as soon as I enable OF_LIVE: > > > > U-Boot 2024.10-00735-gc530f6079c70 (Oct 07 2024 - 12:59:35 -0700) > > > > CPU: Freescale i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz) > > CPU: Industrial temperature grade (-40C to 105C) at 49C > > Reset cause: POR > > Model: Gateworks Venice GW73xx-0x i.MX8MM Development Kit > > DRAM: 4 GiB > > Core: 214 devices, 32 uclasses, devicetree: separate > > WDT: Started watchdog@30280000 with servicing every 1000ms (60s timeout) > > MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2 > > Loading Environment from MMC... Reading from redundant MMC(2)... OK > > In: serial@30890000 > > Out: serial@30890000 > > Err: serial@30890000 > > SEC0: RNG instantiated > > Net: Could not get PHY for mdio: addr 0 > > Could not get PHY for FEC0: addr 0 > > Could not get PHY for mdio: addr 0 > > Could not get PHY for FEC0: addr 0 > > No ethernet found. > > ^^^ phy_connect failing > > > > Any idea what I'm missing here? > > > > Are there other ways I should be modifying the live dt in U-Boot? >
Hi Simon, thanks for the response. > I am not sure, but the best option would be to debug the PHY stuff and > try to see what is going wrong. > > Since the number of devices is smaller, I suspect that there is some > code which doesn't use the ofnode API. But it is hard to say what is > going on. > ok, I will look into that > For modifying the devicetree, you can do it just before relocation > using the flattree if you like. The reason livetree is better is that > the nodes don't move around when changes are made. > Where is relocation done in this case where I'm using SPL and U-Boot proper for imx8m based boards? If I want to utilize dt overlays in U-Boot proper can you point me to what is needed or some examples? I'm intending to detect the presence of an add-in card that has a port expander on it so as to allow that port expander to be accessed via U-Boot. As a bit of a hack I'm currently using flat dt (!OF_LIVE) and putting the port expander in the board dt and attempting to disable it via dt modification in board_init(). As a better approach I could attempt to add it to dt but using an overlay would make so much more sense. Best Regards, Tim
