hi,all
I have tried to use lock_kernel and unlock_kernel rather than spinlocks.
Unfortunately, when copy some data to hard disk while changing PINMUX0 to enabe
EMIF, this will cause write error. Both in DMA and PIO mode will fail. The
error information is as follows:
hdb: status timeout: status=0xff { Busy }
ide: failed opcode was: unknown
hdb: drive not ready for command
ide0: reset: master: ECC circuitry error
hdb: task_out_intr: status=0x31 { DeviceFault SeekComplete Error }
hdb: task_out_intr: error=0xff { DriveStatusError BadCRC UncorrectableError
Sect
orIdNotFound TrackZeroNotFound AddrMarkNotFound }, LBAsect=268435455,
sector=502
7507
ide: failed opcode was: unknown
ide0: reset: master: ECC circuitry error
end_request: I/O error, dev hdb, sector 5027507
Buffer I/O error on device hdb1, logical block 5027444
lost page write due to I/O error on hdb1
end_request: I/O error, dev hdb, sector 5027508
Buffer I/O error on device hdb1, logical block 5027445
lost page write due to I/O error on hdb1
end_request: I/O error, dev hdb, sector 5027509
Buffer I/O error on device hdb1, logical block 5027446
lost page write due to I/O error on hdb1
end_request: I/O error, dev hdb, sector 5027510
Buffer I/O error on device hdb1, logical block
The result is worse than use spinlock, :)
Could you try to practise the whole process?
1)mount /dev/hda1 /mnt
2)cp something.tgz /mnt
3)change to EMIF, mdelay(100), return to ATA, for some loop
hard disk works in DMA or PIO.
thanks.
chendh
----- Original Message -----
From: Steve Spano
To: chendh
Sent: Thursday, November 16, 2006 11:36 AM
Subject: Re: Using both ATA and EMIF
I think i used lock_kernel and unlock_kernel rather than spinlocks
your format is the same as mine
lock
enable
do something
disable
unlock
should work for you
try lock_kernel and unlock_kernel
-----Original Message-----
From: "chendh" <[EMAIL PROTECTED]>
To: "Steve Spano" <[EMAIL PROTECTED]>
Date: Thu, 16 Nov 2006 10:36:14 +0800
Subject: Re: Using both ATA and EMIF
hi,
I use the variable "spinlock_t ide_lock" the lock kernel, then change
PINMUX0, do my actions, and return PINMUX0 and unlock the kernel. The changes
just like:
change to EMIF:
spin_lock_irq(&ide_lock);
enable_emif();
do_something();
disable_emif();
spin_unlock(&ide_lock); //success
spin_unlock_irq(&ide_lock); //failed, why??
in ide drivers, I change nothing.
In PIO mode, the above method is OK, but DMA mode is FAILED.
DMA is out of control of CPU, how to lock kernel? Can you help me? thanks.
chendh
iFLYTEK
----- Original Message -----
From: Steve Spano
To: 'chendh' ; [email protected]
Sent: Wednesday, November 15, 2006 10:50 PM
Subject: RE: Using both ATA and EMIF
Hi
We are using the same scheme in a driver (VPFE) to issue read/writes to
and FPGA.
Just make sure you lock the kernel, set PINMUX0, do your read/write, then
return PINMUX0 and unlock the kernel
DMA mode appears to work fine as well
Steve Spano
FLE
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of chendh
Sent: Wednesday, November 15, 2006 3:32 AM
To: [email protected]
Subject: Using both ATA and EMIF
hi,everyone
I have tried to use both ata and emif, they can be used at the same
time.I try to send some control commands via EMIF, while copy some data to ATA
hard disk.
you can just to use they as follows:
1)change PINMUX0 to enable ATA after kernel boot time
2)when you want to use emif bus to control some device, you can change
PINMUX0 to disable ATA and enable EMIF,then do something.
3)after finishing to use emif, change PINMUX0 to enable ATA, now ata is
accessible
notice:
1)the occasion to change PINMUX0 to enable EMIF is very important, you
must ensure ATA has finished one operation, otherwise, may cause errors.
I know how to ensure it when access ATA hard disk via PIO mode, but don't
known how to do it when access ATA hard disk via DMA or UDMA mode, Can anybody
help me?
------------------------------------------
jit chen
ANHUI USTC iFLYTEK CO.,LTD
Tel: 021-52955071
web: www.iflytek.com
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