Hi, list I found some io memory information is lost from /dev/iomem and want to find out why.
I have a 2.6.16 kernel running on a ARM board (Samsung S3C2410). From the kernel log, I see 16 8250 serial ports were detected, and each of thoese ports has a memory address: Serial: 8250/16550 driver $Revision: 1.90 $ 16 ports, IRQ sharing enabled serial8250: tts0 at MMIO 0xe1400000 (irq = 16) is a 16550A serial8250: tts1 at MMIO 0xe1400008 (irq = 16) is a 16550A serial8250: tts2 at MMIO 0xe1400010 (irq = 17) is a 16550A serial8250: tts3 at MMIO 0xe1400018 (irq = 17) is a 16550A serial8250: tts4 at MMIO 0xe1400020 (irq = 18) is a 16550A serial8250: tts5 at MMIO 0xe1400028 (irq = 18) is a 16550A serial8250: tts6 at MMIO 0xe1400030 (irq = 19) is a 16550A serial8250: tts7 at MMIO 0xe1400038 (irq = 19) is a 16550A serial8250: tts8 at MMIO 0xe1400040 (irq = 48) is a 16550A serial8250: tts9 at MMIO 0xe1400048 (irq = 48) is a 16550A serial8250: tts10 at MMIO 0xe1400050 (irq = 49) is a 16550A serial8250: tts11 at MMIO 0xe1400058 (irq = 49) is a 16550A serial8250: tts12 at MMIO 0xe1400060 (irq = 60) is a 16550A serial8250: tts13 at MMIO 0xe1400068 (irq = 60) is a 16550A serial8250: tts14 at MMIO 0xe1400070 (irq = 61) is a 16550A serial8250: tts15 at MMIO 0xe1400078 (irq = 61) is a 16550A I can read/write these serial ports from /dev/ttys*, in other words, they do exist. I also can find the driver info from /proc/devices: Character devices: ... 4 /dev/vc/0 4 tty 4 tts 5 /dev/tty 5 /dev/console 5 /dev/ptmx 7 vcs ... The problem is, I don't understand why there is no information about these ports in /proc/iomem file. The 'iomem' file now contains: 11000000-11000ffe : AX88796B 19000000-19000ffe : AX88796B 30000000-33ffffff : System RAM 3001c000-301e826b : Kernel text 301ea000-302234a3 : Kernel data 49000000-490fffff : s3c2410-ohci 49000000-490fffff : ohci_hcd 4e000000-4e0fffff : s3c2410-nand 4e000000-4e0fffff : s3c2410-nand 50000000-50003fff : s3c2410-uart.0 50000000-500000ff : s3c2410-uart 50004000-50007fff : s3c2410-uart.1 50004000-500040ff : s3c2410-uart 50008000-5000bfff : s3c2410-uart.2 50008000-500080ff : s3c2410-uart 53000000-530fffff : s3c2410-wdt 54000000-540fffff : s3c2410-i2c 5a000000-5a0fffff : s3c2410-sdi 5a000000-5a0fffff : mmci-s3c2410 You see, there is no serial8250 informations. Can anyone here please tell me how this can happen? Does it mean the serial8250 driver don't populate or register in the /proc/iomem? -- woody I can't go back to yesterday - because I was a different person then. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
