在 2020/8/7 上午11:08, Du Huanpeng 写道:
Hi all, I'm testing a PCIe card to two uarts (WCH CH382L compatible, https://item.jd.com/48547850173.html) on a loongson ls2k1000 board. With the card inserted the kernel detects the two new uarts: [ 2.060884] pci 0000:00:04.1: EHCI: unrecognized capability ff [ 2.066721] pci 0000:00:04.1: EHCI: capability loop? [ 2.066745] pci 0000:00:04.1: quirk_usb_early_handoff+0x0/0xa60 took 358764 usecs [ 2.074542] pcieport 0000:00:09.0: PME: Signaling with IRQ 2 [ 2.080651] pcieport 0000:00:0a.0: PME: Signaling with IRQ 3 [ 2.086648] pcieport 0000:00:0b.0: PME: Signaling with IRQ 4 [ 2.092616] pcieport 0000:00:0c.0: PME: Signaling with IRQ 5 [ 2.098579] pcieport 0000:00:0d.0: PME: Signaling with IRQ 6 [ 2.104557] pcieport 0000:00:0e.0: PME: Signaling with IRQ 7 [ 2.113728] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 2.120891] serial 0000:06:00.0: limiting MRRS to 256 [ 2.126314] 0000:06:00.0: ttyS0 at I/O 0xc0 (irq = 7, base_baud = 115200) is a XR16850 [ 2.134618] 0000:06:00.0: ttyS1 at I/O 0xc8 (irq = 7, base_baud = 115200) is a XR16850 [ 2.143130] 1fe00000.serial: ttyS2 at MMIO 0x1fe00000 (irq = 1, base_baud = 7812500) is a 16550A [ 2.151946] printk: console [ttyS2] enabled [ 2.160255] printk: bootconsole [early0] disabled [ 2.170112] [drm] radeon kernel modesetting enabled. However a write to the serial fails: / # echo "hello" >/dev/ttyS0 [ 9369.631915] serial 0000:06:00.0: LSR safety check engaged! sh: write error: Input/output error
I assume you're using my out-of-tree fork to support LS2K. I messed with Logic PIO in that fork. I'll fix it in mainline, sorry for the issue...
read from the serial, too: / # cat /dev/ttyS0 [ 9531.127623] serial 0000:06:00.0: LSR safety check engaged! cat: read error: Input/output error A dump_stack() in front of the "LSR safety check engaged!" shows the following backtrace: [ 40.891789] [<ffffffff8020e7d4>] show_stack+0x9c/0x130 [ 40.896949] [<ffffffff80685944>] dump_stack+0xb4/0xf0 [ 40.902021] [<ffffffff80743d30>] serial8250_do_startup+0x480/0x888 [ 40.908216] [<ffffffff8073e07c>] uart_startup.part.19+0x12c/0x2c0 [ 40.914321] [<ffffffff8073e27c>] uart_port_activate+0x6c/0xa8 [ 40.920085] [<ffffffff807221b8>] tty_port_open+0xa0/0x128 [ 40.925493] [<ffffffff8073a2ec>] uart_open+0x1c/0x30 [ 40.930467] [<ffffffff80719220>] tty_open+0x118/0x500 [ 40.935530] [<ffffffff80391e0c>] chrdev_open+0xc4/0x1e0 [ 40.940767] [<ffffffff803865e8>] do_dentry_open+0x210/0x480 [ 40.946353] [<ffffffff8039e7e8>] path_openat+0xb38/0xe50 [ 40.951675] [<ffffffff8039fe00>] do_filp_open+0xe8/0x130 [ 40.956996] [<ffffffff80386d8c>] do_sys_openat2+0x1fc/0x338 [ 40.962579] [<ffffffff803884ac>] do_sys_open+0x5c/0x88 [ 40.967728] [<ffffffff80214470>] syscall_common+0x34/0x58 / # cat /proc/ioports 000000c0-000000c7 : serial 000000c8-000000cf : serial / # lspci 00:03.1 Class 0200: 0014:7a03 00:08.0 Class 0106: 0014:7a08 00:0d.0 Class 0604: 0014:7a19 00:10.0 Class 0480: 0014:7a16 00:04.2 Class 0c03: 0014:7a24 00:04.0 Class 0c03: 0014:7a04 00:07.0 Class 0403: 0014:7a07 00:0c.0 Class 0604: 0014:7a09 00:0f.0 Class 0880: 0014:7a0f 06:00.0 Class 0700: 1c00:3253 <-- WCH CH382L 00:03.0 Class 0200: 0014:7a03 00:06.0 Class 0300: 0014:7a06 00:0b.0 Class 0604: 0014:7a09 00:04.1 Class 0c03: 0014:7a14 00:09.0 Class 0604: 0014:7a19 00:0e.0 Class 0604: 0014:7a09 00:11.0 Class 0480: 0014:7a26 00:02.0 Class 0880: 0014:7a02 00:05.0 Class 0302: 0014:7a05 00:0a.0 Class 0604: 0014:7a09 I'm using Yang Jiaxun's kernel and pmon: kernel: https://github.com/FlyGoat/linux branch: loogson/next-testing-2k bootloader: https://github.com/FlyGoat/pmon-ls2k branch: master
Ya, that's my out of tree fork..... Thanks. - Jiaxun
and a simple rootfs: https://sourceforge.net/projects/loongsonpi2/files/source-extra/miniroot.tar.xz For reference, the card work on a standard PC: [ 0.701127] 0000:01:00.0: ttyS4 at I/O 0xe0c0 (irq = 16, base_baud = 115200) is a XR16850 [ 0.701295] 0000:01:00.0: ttyS5 at I/O 0xe0c8 (irq = 16, base_baud = 115200) is a XR16850 The relevant part of /proc/ioports: 0d00-ffff : PCI Bus 0000:00 e000-efff : PCI Bus 0000:01 e000-e0ff : 0000:01:00.0 e0c0-e0c7 : serial e0c8-e0cf : serial Regards, Du Huanpeng