On 8/7/20 10:01 AM, Jiaxun Yang wrote: >> 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... Do you have a tree that we can test? Marc
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