2008-12-01 08:00:12 uClinux firmware directory

Ammar Asi (PAKISTAN)

Message: 66077

Hi,

I want to use wireless usb adapter tl-wn422g from tp-link on Blackfin Asterisk (IP-08). The driver for this adapter is zd1121 which is avaiable in uClinux kernel. I have enabled this driver, built a kernel image and written the image on IP-08.

However, the zd1121 driver provides a firmware which is to be copied in the firmware directory of the distribution. My question is what is the default firmware directory in uClinux? On desktop distributions it is usually /lib/firmware. But on uClinux, it is not reading that directory.

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2008-12-01 08:18:05 Re: uClinux firmware directory

Michael Hennerich (GERMANY)

Message: 66080

It's also lib/firmware here - don't forget to enable Busybox:mdev: Support loading of firmwares

I would use Wifi USB Modules using the RALINK rt2x00 driver such as the DLINK DWL-G122.

The zd1121 driver is a pretty bad choice, since it generates unaligned exceptions.

The driver doesn't care about unaligned all over the place:

It does things like this:

int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)

{

const struct rx_status *status;

status = (struct rx_status *)

(buffer + (length - sizeof(struct rx_status)));

if (status->frame_status ....

sizeof(struct rx_status) = 5

length can be anything

buffer might even be unaligned.

root:/> usb 1-1: new full speed USB device using sl811-hcd and address 2

usb 1-1: configuration #1 chosen from 1 choice

usb 1-1: reset full speed USB device using sl811-hcd and address 2

zd1211rw 1-1:1.0: phy0

usb 1-1: New USB device found, idVendor=1582, idProduct=6003

usb 1-1: New USB device strings: Mfr=16, Product=32, SerialNumber=0

usb 1-1: Product: USB2.0 WLAN

usb 1-1: Manufacturer: ZyDAS

root:/> iwconfig wlan0 essid dlink key s:12345

root:/> ifconfig wlan0 192.168.2.50 up

usb 1-1: firmware: requesting zd1211/zd1211b_ub

usb 1-1: firmware: requesting zd1211/zd1211b_uphr

zd1211rw 1-1:1.0: firmware version 4725

zd1211rw 1-1:1.0: zd1211b chip 1582:6003 v4810 full 00-11-f6 AL2230_RF pa0 ---NS

cfg80211: Calling CRDA for country: DE

root:/> Data access misaligned address violation

- Attempted misaligned data memory or data cache access.

Kernel OOPS in progress

Deferred Exception context

No Valid process in current context

return address: [0x000c6306]; contents of:

0x000c62e0: b130 3004 e3ff fc20 60f8 0806 1807 e14a

0x000c62f0: 0020 e10a bc20 9110 0040 e5a0 2a04 4818

0x000c6300: 1c3d e120 008c [9539] 5401 e122 0088 0810

0x000c6310: e120 0300 0202 5441 0801 0200 5982 0c06

SEQUENCER STATUS: Not tainted

SEQSTAT: 00060024 IPEND: 9030 SYSCFG: 0006

EXCAUSE : 0x24

physical IVG12 asserted : <0xffa00db8> { _evt_evt12 + 0x0 }

physical IVG15 asserted : <0xffa00dd0> { _evt_system_call + 0x0 }

logical irq 6 mapped : <0xffa00390> { _timer_interrupt + 0x0 }

logical irq 10 mapped : <0x000fe5b4> { _bfin_rtc_interrupt + 0x0 }

logical irq 16 mapped : <0x00100ccc> { _bfin_twi_interrupt_entry + 0x0 }

logical irq 18 mapped : <0x000ba02c> { _bfin_serial_dma_rx_int + 0x0 }

logical irq 19 mapped : <0x000b9d9c> { _bfin_serial_dma_tx_int + 0x0 }

logical irq 24 mapped : <0x000c3e88> { _bfin_mac_interrupt + 0x0 }

logical irq 42 mapped : <0x000a4de4> { _bfin_lq035q1_irq_error + 0x0 }

logical irq 54 mapped : <0x000ebb30> { _usb_hcd_irq + 0x0 }

RETE: <0x00000000> { _do_one_initcall + 0xfffff000 }

RETN: <0x00227d34> /* kernel dynamic memory */

RETX: <0x00000480> /* Maybe fixed code section */

RETS: <0x000c6226> { _zd_mac_rx + 0x8e }

PC : <0x000c6306> { _zd_mac_rx + 0x16e }

DCPLB_FAULT_ADDR: <0x031e2004> /* kernel dynamic memory */

ICPLB_FAULT_ADDR: <0x000c6306> { _zd_mac_rx + 0x16e }

PROCESSOR STATE:

R0 : 0000008c R1 : 000000d4 R2 : 0000000c R3 : 00000000

R4 : 037cc1a0 R5 : 000000df R6 : 00000000 R7 : 031e2000

P0 : 00000001 P1 : 00000090 P2 : 031e2000 P3 : 031e2000

P4 : 037ccd00 P5 : 031e20da FP : 031e2005 SP : 00227c58

LB0: ffa01820 LT0: ffa0181e LC0: 00000000

LB1: 00292b91 LT1: 00292b8a LC1: 00000000

B0 : 00000000 L0 : 00000000 M0 : 00000000 I0 : 03190000

B1 : 00000000 L1 : 00000000 M1 : 00000000 I1 : 00000000

B2 : 00000000 L2 : 00000000 M2 : 00000000 I2 : 00000000

B3 : 00000000 L3 : 00000000 M3 : 00000000 I3 : 00000000

A0.w: 000002c1 A0.x: 00000000 A1.w: 000002c1 A1.x: 00000000

USP : 00228000 ASTAT: 02002002

Hardware Trace:

0 Target : <0x000049ac> { _trap_c + 0x0 }

Source : <0xffa006fa> { _exception_to_level5 + 0x9e } CALL pcrel

1 Target : <0xffa0065c> { _exception_to_level5 + 0x0 }

Source : <0xffa004ee> { _bfin_return_from_exception + 0xe } RTX

2 Target : <0xffa004e0> { _bfin_return_from_exception + 0x0 }

Source : <0xffa005b2> { _ex_trap_c + 0x66 } JUMP.S

3 Target : <0xffa0054c> { _ex_trap_c + 0x0 }

Source : <0xffa00794> { _trap + 0x38 } JUMP (P4)

4 Target : <0xffa0077a> { _trap + 0x1e }

Source : <0xffa00776> { _trap + 0x1a } IF !CC JUMP

5 Target : <0xffa0075c> { _trap + 0x0 }

Source : <0x000c6302> { _zd_mac_rx + 0x16a } 0xe120

6 Target : <0x000c6302> { _zd_mac_rx + 0x16a }

Source : <0x000c6278> { _zd_mac_rx + 0xe0 } IF CC JUMP

7 Target : <0x000c625e> { _zd_mac_rx + 0xc6 }

Source : <0x000c623c> { _zd_mac_rx + 0xa4 } IF !CC JUMP

8 Target : <0x000c6236> { _zd_mac_rx + 0x9e }