Misbah khan wrote:
>
>
> Scott Wood-2 wrote:
>> They're used all over the place. Is there anything about them that you
>> find suspect?
>>
>> -Scott
>>
>> I have devloped a character driver for FPGA which is memory mapped and
>> using these API's to test a bit , set a bit or to clear a bit in the
>> memory for eg :-
Please don't use quote markers on newly added text.
>> /* poll till data is transfered from sdram to dpram */
>> while((test_bit(DFR_BUSY,(UINT32 *)(\
>> (void *)mmap_reg_ptr + DATA_STATUS_REG))==1)\
>> && (delay < MAX_DELAY_BUSY))
You should use in_be32() rather than direct dereferencing.
>> {
>> KDEBUG3(" In the Dfr delay loop \n");
>> mdelay(DELAY);
>> delay+=DELAY;
>> }/* End of while(test_bit(FPGA_BUSY,(void *)register name) */
>>
>> if(delay==MAX_DELAY_BUSY)
>> {
>> KDEBUG1("Out of the the Dfr busy loop \n");
>> return -1;
>> }
>>
>> People working for FPGA are sure that they are not making the bit high
>> where in my driver is returning -1 from the kernel space aborting it after
>> running for few minutes or so .
I don't suppose the "few minutes" corresponds to MAX_DELAY_BUSY?
-Scott
_______________________________________________
Linuxppc-embedded mailing list
[email protected]
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
