Okay, second pass more things work, more corner cases to fix... Here is the base u-boot patch, plus the cape manager:
https://github.com/RobertCNelson/Bootloader-Builder/blob/master/patches/v2017.01-rc2/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch https://github.com/RobertCNelson/Bootloader-Builder/blob/master/patches/v2017.01-rc2/0002-U-Boot-BeagleBone-Cape-Manager.patch Probally lots of string handling bugs, found my self trying to write everything in bash, yet it's C.. ;) So, the fun details of U-Boot: U-Boot found the BeagleBone Serial Cape: Board: BeagleBone Black <ethaddr> not set. Validating first E-fuse MAC BeagleBone: cape eeprom: i2c_probe: 0x54: BeagleBone: cape eeprom: i2c_probe: 0x55: /lib/firmware/BB-BONE-SERL-03-00A1.dtbo BeagleBone: cape eeprom: i2c_probe: 0x56: BeagleBone: cape eeprom: i2c_probe: 0x57: Net: eth0: MII MODE U-Boot loaded the BeagleBone Serial Cape overlay on top of the main dtb: loading /boot/dtbs/4.4.39-ti-r77/am335x-boneblack.dtb ... 62069 bytes read in 135 ms (448.2 KiB/s) debug: [uboot_overlay_addr1=/lib/firmware/BB-BONE-SERL-03-00A1.dtbo] ... loading /lib/firmware/BB-BONE-SERL-03-00A1.dtbo ... 887 bytes read in 189 ms (3.9 KiB/s) loading /boot/initrd.img-4.4.39-ti-r77 ... 5237762 bytes read in 466 ms (10.7 MiB/s) debug: [console=ttyO0,115200n8 bone_capemgr.disable_partno=BB-BONE-SERL-03 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M quiet net.ifnames=0] ... debug: [bootz 0x82000000 0x88080000:4fec02 88000000] ... Kernel: second ttyS2 comes up nice and early... root@beaglebone:~# dmesg | grep serial [ 2.073749] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 158, base_baud = 3000000) is a 8250 [ 2.088159] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 159, base_baud = 3000000) is a 8250 [ 7.807662] systemd[1]: Created slice system-serial\x2dgetty.slice. Hurrah!!! First issue... Now the Kernel Cape Manager get's in the way, i need to pass a global kill switch (or find the global disable), right now you have to "disable" capes loaded by U-Boot.. (you don't have too, it just looks weird when they both load fine..) root@beaglebone:~# dmesg | grep bone [ 0.000000] Kernel command line: console=ttyO0,115200n8 bone_capemgr.disable_partno=BB-BONE-SERL-03 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M quiet net.ifnames=0 [ 2.345976] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,00C0,2516BBBK2626' [ 2.346020] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4 [ 2.382381] bone_capemgr bone_capemgr: slot #0: No cape found [ 2.412268] bone_capemgr bone_capemgr: slot #1: 'BeagleBone RS232 CAPE,00A1,Beagleboardtoys,BB-BONE-SERL-03' [ 2.450326] bone_capemgr bone_capemgr: slot #2: No cape found [ 2.494321] bone_capemgr bone_capemgr: slot #3: No cape found [ 2.500199] bone_capemgr bone_capemgr: Skipping loading of disabled cape with part# BB-BONE-SERL-03 [ 2.500214] bone_capemgr bone_capemgr: initialized OK. [ 6.813904] systemd[1]: Set hostname to <beaglebone>. [ 15.389423] LUN: removable read only file: /var/cache/doc-beaglebone-getting-started/beaglebone-getting-started-2016-11-07.img So to actually test follow: *************Actual testing...*************************************** Step 1: Do you have a usb serial adapter to monitor the boot process? no = stop reading now... till you have one in hand... yes = please continue Step 2: Remove /uEnv.txt (i forgot to code that path in this test) rm /uEnv.txt Step 3: Update u-boot to v2017.01-rc2 cd /opt/scripts/tools/developers/ git pull ./update_bootloader.sh --use-beta-bootloader On reboot, it should show: U-Boot SPL 2017.01-rc2-00003-g835d6bbf46 (Dec 29 2016 - 15:28:49) Trying to boot from MMC1 U-Boot 2017.01-rc2-00003-g835d6bbf46 (Dec 29 2016 - 15:28:49 -0600), Build: jenkins-github_Bootloader-Builder-496 If not, eMMC probably messing with you.. dd if=/dev/zero of=/dev/mmcblk1 bs=1M count=10 Step 4: /boot/uEnv.txt remove "cape_universal=enable" we dont want any false posititves... and remember to disable your Kernel overlay: cape_disable=bone_capemgr.disable_partno=BB-BONE-SERL-03 Step 5: Profit!!! ;) ***************************************************************** I know it's a little limited, but something for testing over Christmas. ;) FAQ: What does this solve? Lots of random kernel races... (looking at video/emmc/etc)... As U-Boot updates the final *.dtb and not the kernel... What about 2+ overlays? "should" work, we should be able to load 4 cape's via eeprom ID, plus a 5th via: dtb_overlay in /boot/uEnv.txt Does this replace the current method? Yes, I'm thinking for v4.10.x+ ;) What have you tested it on? Just BB-UART2-00A0.dtbo and then i wrote this email up and got ready to go home... Will this fix the issue with the painful out of box experience with LCD3/LCD4/LCD7? Correct, as long as they have an eeprom. ;) How do i actually test things? Easiest, /boot/uEnv.txt dtb=am335x-boneblack-overlay.dtb Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. 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