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Sad file transfer stalls at 115200 baud serial line speed 

Forum: PCMCIA Serial and Modem Issues
Date: 2000, Aug 27
From: Michael Feig meikkel

I am having similar problems as previously posted here and on the Xircom list with large file transfers (ftp over PPP) stalling reproducibly at the same point. While there was no mention of this in the earlier posts this only seems to happen in my system when the serial line speed is set to 115200 baud.

I have an Acer TravelMate 524TXV with an O2 Micro CardBus adapter running RedHat 6.2 with 2.2.16 kernel and PCMCIA version 3.1.19. I tried both a Xircom RealPort 56K as well as an ActionTec 56K Datalink PCMCIA card with the same problem.

Using PCIC_OPTS="pci_csc=1 pci_int=1" in the PCMCIA options file (/etc/sysconfig/pcmcia) helps a little bit for the Xircom card but does not seem to do much for the Actiontec. "A little bit" means that the file transfer does not stall completely but continues very sluggishly after the stalling point and eventually completes. The only fix so far is reducing the serial line speed to 57600 which is not desirable for a 56K modem using compression.

I have no idea at this point what else to try to get a 56K PCMCIA modem working with 115000 baud serial line speed and would be thankful for any suggestions.

I am also not sure how to isolate further what component is causing the problem (serial_cs, pcmcia_core, pppd?).

For reference various information from my system:

lspci:

00:00.0 Host bridge: Acer Laboratories Inc. [ALi] M1621 (rev 05)
00:01.0 PCI bridge: Acer Laboratories Inc. [ALi] M5247 (rev 01)
00:06.0 Multimedia audio controller: Acer Laboratories Inc. [ALi]: Unknown device 5451 (rev 01)
00:07.0 ISA bridge: Acer Laboratories Inc. [ALi] M1533 PCI to ISA Bridge [Aladdin IV]
00:0a.0 Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100] (rev 08)00:10.0 IDE interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev c3)
00:11.0 Bridge: Acer Laboratories Inc. [ALi] M7101 PMU
00:13.0 CardBus bridge: O2 Micro, Inc.: Unknown device 6933 (rev 01)
00:13.1 CardBus bridge: O2 Micro, Inc.: Unknown device 6933 (rev 01)
00:14.0 USB Controller: Acer Laboratories Inc. [ALi] M5237 USB (rev 03)
01:00.0 VGA compatible controller: ATI Technologies Inc 3D Rage P/M Mobility AGP 2x (Rev. 64)

dmesg:

...
Linux PCMCIA Card Services 3.1.19
  kernel build: 2.2.16-3 #11 Sat Aug 26 22:16:57 PDT 2000
  options:  [pci] [cardbus] [apm] [pnp]
PCI routing table version 1.0 at 0xfb9d0
  00:13.0 -> irq 11
  00:13.1 -> irq 11
PnP: PNP BIOS installation structure at 0xc00f65b0
PnP: PNP BIOS version 1.0, entry at fa000:0, dseg at f0000
Intel PCIC probe:
  Unknown [1217 6933] rev 01 PCI-to-CardBus at slot 00:13, mem 0x68000000
    host opts [0]: [pci irq 11] [lat 32/176] [bus 32/34]
    host opts [1]: [pci irq 11] [lat 32/176] [bus 35/37]
    ISA irqs (default) = 3,5,9 PCI status changes
cs: IO port probe 0x1000-0x17ff: clean.
cs: IO port probe 0x0100-0x04ff: clean.
cs: IO port probe 0x0a00-0x0aff: clean.
cs: memory probe 0xa0000000-0xa0ffffff: clean.
tty01 at 0x13f8 (irq = 3) is a 16550A
...                         

/etc/sysconfig/pcmcia:

PCMCIA=yes PCIC=i82365 PCIC_OPTS="pci_csc=1 pci_int=1" CORE_OPTS=

/etc/pcmcia/config.opts: (unmodified from default)

#
# Local PCMCIA Configuration File
#
# System resources available for PCMCIA devices
#
include port 0x100-0x4ff, port 0x1000-0x17ff include memory 0xc0000-0xfffff include memory 0xa0000000-0xa0ffffff, memory 0x60000000-0x60ffffff
#
# Extra port range for IBM Token Ring
#
include port 0xa00-0xaff
#
# Resources we should not use, even if they appear to be available
#
# First built-in serial port
exclude irq 4
# Second built-in serial port
#exclude irq 3
# First built-in parallel port
exclude irq 7
# PS/2 Mouse controller port, comment this out if you don't have a PS/2
# based mouse
exclude irq 12
#
# Examples of options for loadable modules
#
# To fix sluggish network with IBM ethernet adapter...
#module "pcnet_cs" opts "mem_speed=600"
#
# Options for Xircom Netwave driver...
#module "netwave_cs" opts "domain=0x100 scramble_key=0x0"
#
# Options for IBM Token Ring adapters
#module "ibmtr_cs" opts "mmiobase=0xd0000 srambase=0xd4000"     

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