[ts-7000] Unable to Use the WiFi after resolving 10ms timing issue.

["mohit.khanna" <>]

Hello,

We have a TS7250 board with Linux 2.4.26-ts11 kernel. We had got the WiFi 
interface working with the ZD1211B driver and the following modules

insmod usbcore
insmod pcipool
insmod usb-ohci
insmod usb-ohci-ep93xx
insmod scsi_mod
insmod sd_mod
insmod usb-storage;
#Driver for wifi
insmod /root/FREEDM/drivers/zd_b.o
sleep 2
#associating with AP
iwconfig wlan0 essid xxxx
sleep 2 
#necessary for dhcp
insmod af_packet
sleep 2 
udhcpc -i wlan0

We resolved the 10ms timing issue to microsecond resolution using the
2.4-ts11-hrt.patch, linux-2.4-ts11-lck1.patch, linux-2.4-ts11-vhz.patch   
patches and changing the CONFIG_HZ=100 to CONFIG_HZ=10000 in the config files 
and compiling the kernel again.

Things seem to work fine till we tried the WiFi again.

Apparently the usb_ohci_ep93xx.o results in a null pointer exception when run 
for the first time after bootup and no wlan0 interface shows up on running 
iwconfig.

Using /lib/modules/2.4.26-ts11/kernel/drivers/usb/host/usb-ohci-ep93xx.o
usb-ohci.c: USB OHCI at membase 0xe0020000, IRQ 56
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
hub.c: 3 ports detected
Unable to handle kernel NULL pointer dereference at virtual address 00000008
pgd = d0098000
[00000008] *pgd=010b3801, *pmd = 010b3801, *pte = 00000000, *ppte = 00000000
Internal error: Oops: 7
CPU: 0
pc : [<d403a044>]    lr : [<d403a228>]    Tainted: P 
sp : d20bbe80  ip : a0000013  fp : 00000000
r10: c03701bc  r9 : 00000000  r8 : d20bbee8
r7 : 00000000  r6 : c102e600  r5 : 00000000  r4 : d4044588
r3 : 00000000  r2 : 00000000  r1 : c102e600  r0 : d4044588
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: C000317F  Table: E0098000  DAC: 00000015
Process busybox (pid: 100, stack limit = 0xd20ba380)
Stack: (0xd20bbe80 to 0xd20bc000)
be80: 00000000 c102e624 00000000 c102e600 c102e600 00000000 d4044588 00000000 
bea0: d20bbee8 d20ba000 00189c58 d104cb40 d403a228 00000000 c102e600 00000008 
bec0: d403c0b8 00000008 c102e600 d3041800 00000038 d404cf94 d3041800 00000000 
bee0: d404d47c d3041800 c0003635 c034209c d404f340 d404f000 c51ea000 00000060 
bf00: ffffffea d404f160 d404f1cc d404f1d8 c023c9d4 0000000f c51ea000 c11df000 
bf20: d4051000 00000060 d404a000 d404f060 00000378 00000000 00000000 00000000 
bf40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
bf60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
bf80: 00000000 00000020 00000378 00189c58 00000080 c022d6e4 d20ba000 00000378 
bfa0: 00000000 c022d540 00000378 00189c58 00900080 0017f3f8 00189c58 00000000 
bfc0: 00000020 00000378 00189c58 d404f000 0017f3f8 0008b0a0 00000378 7ffffe1c 
bfe0: 7fffda14 7fffda08 0006aecc 2ac3f130 60000010 00900080 00000000 00000000 
Backtrace: no frame pointer
Code: 1a000062 e3cd3d7f e3c3303f e5933320 (e5933008) 
Segmentation fault
hub.c: new USB device not_pci-3, assigned address 2
usb.c: USB device 2 (vend/prod 0xace/0x1215) is not claimed by any active 
driver.
Unable to handle kernel NULL pointer dereference at virtual address 00000008
pgd = c0214000
[00000008] *pgd=00000000, *pmd = 00000000
Internal error: Oops: 7
CPU: 0
pc : [<d403a044>]    lr : [<d403a228>]    Tainted: P 
sp : c50b9f40  ip : c50b9f5c  fp : 00000000
r10: c03701bc  r9 : 00000000  r8 : 0000000a
r7 : 00000000  r6 : c102e800  r5 : 00000000  r4 : d4044588
r3 : 00000000  r2 : 00000000  r1 : c102e800  r0 : d4044588
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user
Control: C000317F  Table: E0098000  DAC: 00000015
Process busybox (pid: 97, stack limit = 0xc50b8380)
Stack: (0xc50b9f40 to 0xc50ba000)
9f40: c036f3c4 00000055 0000000a c03b7960 c102e800 00000000 d4044588 d4046228 
9f60: 0000000a 00000008 00000000 c03b7960 d403a228 00000000 c102e800 00000008 
9f80: d403c0b8 00000008 c102e800 c102e600 00000002 d403d9f4 c0254740 00000003 
9fa0: c102e600 c03b7960 00000002 ffffffea d20ba000 001a9d30 00000000 d403dbdc 
9fc0: 01010001 c50b8000 d4046238 c50b9fd8 00000060 d403ddac 00000000 c50b8000 
9fe0: 00000000 00000000 00000000 d20ba000 c073f000 c022ec68 00000000 00000000 
Backtrace: no frame pointer
Code: 1a000062 e3cd3d7f e3c3303f e5933320 (e5933008) 



Could someone give me some pointers to act upon...?

Thanks
Mohit Khanna



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