The sysfs GPIO interface does not allow you to create clock outputs as-is. You'd do better seeing if that pin can be exposed through the sysfs PWM interface. I know the NanoPi M4V2's fan controller works this way (RK3399), and you can set the duty cycle. But you'd have to check if PWM is supported on that pin, and can be used in the way you're hoping. Failing that, it is possible to bit-bang the GPIO lines yourself if you're willing to write some C code. You can use Kernel Timers for fairly accurate timing, as long as you set High Scheduler Priority and Real Time Scheduler Class. Note that kernel timers only have a user specified resolution of 1ns, so you might not hit that frequency exactly.

Probably a new product. Images are not compatible unless specifically marked as such.

Regarding the vendor kernel I also managed to get the GPU going with some AI help, but the HDMI hotplug issue persists. Will probably revisit it in the future. (the dtb should go in packages/blobs/h96-m9_original.dtb and the defconfig in patch/u-boot/legacy/u-boot-radxa-rk35xx/deconfig) h96-m9.csc h96-m9_original.dts h96-m9-rk3576_defconfig h96-m9_original.dtb

I'm trying to get a clock signal of 32768 from the GPIO1 D4 pin of the rk3328 CPU, but I haven't been able to. I've tried everything, from `overlay dts` to `armbian-add-overlay`, but I can't get any output. I can set the value to 1 or 0 using the `echo 1 > /sys/class/gpio/gpio60/value` command, but the system doesn't give a clock output. Please help. Thank you in advance.

I'm moving forward. I managed to get the FEL - a true Male A <> Male A USB cable is required. FEL mode is now working. I'm able to transfer the u-boot-sunxi-with-spl.bin of Armbian but TX1 is booting on Android immediately (based on Armbian-unofficial_26.02.0-trunk_X96q-v5-1_bookworm_current_6.12.64_minimal.img - u-boot-sunxi-with-spl.bin extracted). This means that I don't have the possibility to boot on the Armbian USB drive (flashed with u-boot-sunxi-with-spl.bin) Similarly, I tried with another image based on MiniArch (MiniArch-20240715-6.18.7-board-h313.tanix_tx1-SD-Image.img.xz). I was able to transfer those MiniArch via FEL: sunxi-fel -v -p uboot bootloader/u-boot-sunxi-with-spl.bin write 0x40200000 Image write 0x4fa00000 dtbs/allwinner/sun50i-h313-tanix-tx1.dtb write 0x4fc00000 load-kernel.scr Original made Load-kernel.scr in the MiniArch-20240715-6.18.7-board-h313.tanix_tx1-SD-Image.img.xz : setenv bootargs console=ttyS0,115200 root=/dev/sda2 rw rootwait ram=1024M debug booti 0x40200000 - 0x4fa00000 With the MiniArch FEL, the TX1 is not booting on Android and I can see 4 penguins with cursor. I updated the load-kernel.scr to have some verbose by changing the console: setenv bootargs console=tty1 console=ttyS0,115200 root=/dev/sda2 rw rootwait rootdelay=60 ram=1024M debug loglevel=7 booti 0x40200000 - 0x4fa00000 Result: MiniArch bootloader and FEL transfer writes allow to boot. USB devices are detected (USB Hub, USB drive, keyboard) but nothing happens further, or it ends up with a kernel panic. Output of the Linux TX1 console after MiniArch FEL transfer sequence: 1.651121] sunxi-mc 4022000.mmc: initialized, max. request size: 2048 KB, u [ top_ops) 1.655936] sunti-drm display-engine: bound 6510000.tcon-top Cops sunBi_tcon_ 1.973277] mnc2: new high speed DDR MMC card at address 0001 _tcon_ops) 1.9745881 sunfi-drm display-engine: bound 6515000. lcd-controller Cops sunti 1.9789521 mncblk2: mmc2:0001 HAGZe@ 14.7 GiB 1.9825631 sunBi-du-hdmi 6000000.hdmi: Detected HDMI TX controller u2.12a wi th HDCP (DWC HDMI 2.0 TX PHY) p17 1.990428] mncblk2: p1 p2 p3 p1 p5 p6 p? p8 p9 p10 p11 p12 p13 p14 p15 p16 [ iver 1.991663] sunBi-du-hdmi 6000000.hdmi: registered Designbare HDMI I2C bus dr 1.998192] mncblkbooto: mnc2:0001 HAGZed 4.00 MiB 1.999521] sunti-drn display-engine: bound 6000000.hdmi Cops sunBi_du hami_o ps) 2.007404] mncblk2boot1: mnc2:0001 HAGZes 4.00 MiB 2.012147] [drm] Initialized sunfi-drm 1.0.0 for display-engine on minor o 2.723997] Console: switching to colour frane buffer device 240x67 2.7468481 sunti-den display-engine: larm] fb0: sunti-drodrufb frame buffer device 2.7554683 2.7573363 usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 6.18 of_cis_init 2.7599291 sunxi-nuc 4021000.mmc: allocated mnc-purseg 2. 763866] ush usb3: New USE device strings: Mfr=3, Product=2, SerialNumber=1 2.766352] of_cfs_init: 0K 2.771541] usb usb3: Product: Generic Platform OHCI controller 2.7789161 clk: Disabling unused clocks 2.781535] usb usb3: Manufacturer: Linux 6.18.7 ohci_hcd 2.785297] sunxi-nnc 4021000.mnc: initialized, max. request size: 16384 KB, uses new tinings mode 2.7875991 PM: genpd: Disabling unused power domains 2.7914431 usb usb3: SerialNumber: 5101400 .usb 2.8161741 check access for rdinit=/init failed: -2, ignoring 2.816738] hub 3-0:1.0: USB hub found [2.822049 Waiting 90 sec before mounting root device... 2.831452] hub 3-0:1.0: 1 port detected 2.8428851 mnc1: new high speed SDIO card at address 0001 7.4519021 usb 3-1: new full-speed USB device number 2 using ohci-platform 7.6636101 usb 3-1: New USB device found, idVendor=0a05, idProduct=7211, bcdDevice= 1.00 7.6718951 usb 3-1: New USB device strings: Mfr=0, Product=1, Seria lNumber=0 7.679084] usb 3-1: Product: USBZ.0 HUB 7.684782J hub 3-1:1.0: USB hub found 7.6896091 hub 3-1:1.0: 4 ports detected 8.115235] usb 3-1.1: new full-speed USB device number 3 using ohci-platform 8.224936] usb 3-1,1: not running at top speed; connect to a high speed hub 8.266936] usb 3-1.1: New USB device found, idVendor=059f, idProduct=1022, bcdDevice= 1.00 8.2753821 8.282744] USD 3-1,1: New USB device strings: Mfral, Product=2, SerialMunber=3 usb 8.2871451 usb 3-1.1: Product: LaCie lanaKey 8.2912791 usb 3-1.1: Manufacturer: LaCie 3-1.1: SerialNumber: 97e0bfb3cfe007 8.501898] แรง 3-1.2: new full-speed USB device number 4 using ohci-platform 8.6079401 8.6163791 usb 3-1.2: New USB device found, idVendor=0318, idProduct=2808, bcdDevice= 2.00 3-1.2: New USB device strings: Mfr=0, Product=1, Seria lNumber=0 8.6237581 usb 3-1.2: Product: 2.4G Composite Devic 8.711901] uSb 3-1.3: new low-speed USB device number 5 using ohci-platform 8.847941] usb 8.8563831 usb 3-1.3: New USB device found, idVendor=04f2, idProduct=0403, bcdDevice= 1.65 3-1.3: New USB device strings: Mfr=1, Product=2, Seria lNumber=0 8.865882] usb 3-1.3: Product: USB Keyboard 8.8722631 usb 3-1.3: Manufacturer: Chicony 12.851997] sun501-h6-prcm-ppu 7010250. power-controller: sync_state() pending due to 1800000. gpu If I wait, I ended up seeing a kernel panic : Kernel panic - not suncing: UFS: Unable to mount rout fs ; on unknoun-block(0,0) 93.6966821 b30d 93.696690] 03.7097151 b30e 93.7097231 93.7224501 b30f 93.7227581 93.7357951 b310 93.735804] 33.748859] b311 163B4 mncblk2p9 а0085546-4166-744a-a353-fca9272bBe4d 163B4 mncblk2p10 а0085546-4166-741a-a353-fca9272bBete 16384 mncblk2p11 a0085546-4166-744a-a353-fca9272bBe4f 16384 mmcblkZp12 а0085546-4166-744a-a353-fca9272bBe50 512 mmcblk2p13 a0085546-4166-744a-a353-fca9272bBe51 15872 mncblk2p14 a0085546-4166-744a-a353-fca9272bBe52 163B4 mncblk2p15 a0085546-4166-744a-a353-fca9272bBe53 16384 mncblk2p16 а0085546-4166-744a-a353-fca9272bBe54 11423727 mmcblk2p17 a0085546-4166-744a-a353-fca9272bBe55 93.748867] 93.761944] b320 4096 mmcblkZbooto 93.7619521 (driver?) 93.7121621 b340 4096 mmcblk2boot1 93.7121121 (driver?) 99.7835151 List of all bdeu filesystems: 33.7895001 exts 93.7895061 ext4 93.793371] extz 33.7972031 ufat 93.8010141 msdos 93.8048091 93.8120251 Kernel panic - not suncing: UFS: Unable to mount rout fs ; on unknoun-block(0,0) 93.8221681 CPU: 2 UID: 0 PID: 1 Comm: swapper/0 Tainted: G 6.18.7 #1 PREEMPT 56ea6Zc682B4f70bf2 93.9338801 -1 end Kernel panic - not syncing: UFS: Unable to mount root fs on unknown-block(0,0) }— 93.836517] Tainted: [WI-WARN 93.841380] Hardware name: Tanix TX1 (DT) 93.8472801 Call trace: 93.8515981 show_stack+0x24/0x70 (C) 93.857135] dump_stack_lul+0x74/0x94 93.8626511 dump _stack+0x14/0x24 93.8677961 upanic+0x104/0x2d4 93.872767] panic +0x5c/0x64 93.877447] mount root gener ic+0x14/0x29B 93.8834131 mount_root +0x16c/0x188 93.8886741 prepare _namespace +0x1cc/0x22c 93.8945131 kernel_init_frecable+0x264/0x284 93.900587] kernel_init+0x1c/0x140 93.905767] ret_from_fork+0x10/0x20 93.9110311 MP: stopping secondary CPU: 93.9166281 Kernel Offset: disable 93.9217681 CPU features: At this stage, I'm stuck with the TX1 : - Armbian Image - no boot success - FEL difficult - MiniArch - boot started but stuck Any help would be appreciated.