* Problem of PowerPc 82xx when using smc
@ 2010-05-20 8:58 hellohello
2010-05-20 17:06 ` Scott Wood
0 siblings, 1 reply; 8+ messages in thread
From: hellohello @ 2010-05-20 8:58 UTC (permalink / raw)
To: linuxppc-dev
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I find a problem in
drivers/serial/cpm_uart/cpm_uart_cpm2.c:
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
{
... ...
pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
/*The above line should be ：*/
pinfo->tx_bd_base = pinfo->rx_bd_base + sizeof(cbd_t) * pinfo->rx_nrfifos;
return 0;
}
Where to get the newest code for kernel?
How to know whether it is already patched by anyone else? Just search in this mail list?
My Linux Kernel is 2.6.25, platform is mpc82XX.
Thanks for any help.
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
2010-05-20 8:58 Problem of PowerPc 82xx when using smc hellohello
@ 2010-05-20 17:06 ` Scott Wood
2010-05-21 3:33 ` hellohello
0 siblings, 1 reply; 8+ messages in thread
From: Scott Wood @ 2010-05-20 17:06 UTC (permalink / raw)
To: hellohello; +Cc: linuxppc-dev
On Thu, May 20, 2010 at 04:58:27PM +0800, hellohello wrote:
>
> I find a problem in
> drivers/serial/cpm_uart/cpm_uart_cpm2.c:
> int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
> {
> ... ...
> pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
> /*The above line should be ：*/
> pinfo->tx_bd_base = pinfo->rx_bd_base + sizeof(cbd_t) * pinfo->rx_nrfifos;
No, it shouldn't -- rx_bd_base is of type "cbd_t *", so the multiplication
already happens as part of pointer arithmetic.
> return 0;
> }
>
> Where to get the newest code for kernel?
git.kernel.org
> How to know whether it is already patched by anyone else? Just search in this mail list?
As well as the current git tree.
-Scott
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
2010-05-20 17:06 ` Scott Wood
@ 2010-05-21 3:33 ` hellohello
2010-05-21 11:20 ` Gary Thomas
2010-05-21 17:28 ` Scott Wood
0 siblings, 2 replies; 8+ messages in thread
From: hellohello @ 2010-05-21 3:33 UTC (permalink / raw)
To: Scott Wood; +Cc: linuxppc-dev
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
2010-05-21 3:33 ` hellohello
@ 2010-05-21 11:20 ` Gary Thomas
2010-05-22 3:37 ` hellohello
2010-05-21 17:28 ` Scott Wood
1 sibling, 1 reply; 8+ messages in thread
From: Gary Thomas @ 2010-05-21 11:20 UTC (permalink / raw)
To: hellohello; +Cc: Scott Wood, linuxppc-dev
On 05/20/2010 09:33 PM, hellohello wrote:
>> No, it shouldn't -- rx_bd_base is of type "cbd_t *", so the multiplication
>> already happens as part of pointer arithmetic.
> ---Yes, you are right. I made a basic mistake.
>
> But now I have another question.
> The SMC1 params can be relocated to any offset of the DPRAM on a 64 byte boundary, not as the SCC1, which must be at 0x8000 offset of the DPRAM.
> The SMC1 params base is set at 0x87FC offset of the DPRAM.
>
> So if I want SMC1 params start at 0x200 in DPRAM , I should set 0x200 to the 0x87FC offset of the DPRAM.
> I have see this code in u-boot, but I can not find this code in neither cpm_uart_cpm2.c nor cpm_uart_core.c.
>
> Should I add these code to cpm_uart_core.c?
>
> --dp_mem = cpm_dpram_addr(0x87fc);
> --out_be16(dp_mem, SMC1_BASE);
Why are you mucking about with this code at all? SMCx serial certainly
works on every platform I've ever used, 8xx and 8xxx as well.
> ----- Original Message -----
> From: "Scott Wood"<scottwood@freescale.com>
> To: "hellohello"<hellohello008@163.com>
> Cc:<linuxppc-dev@lists.ozlabs.org>
> Sent: Friday, May 21, 2010 1:06 AM
> Subject: Re: Problem of PowerPc 82xx when using smc
>
>
>> On Thu, May 20, 2010 at 04:58:27PM +0800, hellohello wrote:
>>>
>>> I find a problem in
>>> drivers/serial/cpm_uart/cpm_uart_cpm2.c:
>>> int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
>>> {
>>> ... ...
>>> pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
>>> /*The above line should be ：*/
>>> pinfo->tx_bd_base = pinfo->rx_bd_base + sizeof(cbd_t) * pinfo->rx_nrfifos;
>>
>> No, it shouldn't -- rx_bd_base is of type "cbd_t *", so the multiplication
>> already happens as part of pointer arithmetic.
>>
>>> return 0;
>>> }
>>>
>>> Where to get the newest code for kernel?
>>
>> git.kernel.org
>>
>>> How to know whether it is already patched by anyone else? Just search in this mail list?
>>
>> As well as the current git tree.
>>
>> -Scott
>> _______________________________________________
>> Linuxppc-dev mailing list
>> Linuxppc-dev@lists.ozlabs.org
>> https://lists.ozlabs.org/listinfo/linuxppc-dev
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
------------------------------------------------------------
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
2010-05-21 3:33 ` hellohello
2010-05-21 11:20 ` Gary Thomas
@ 2010-05-21 17:28 ` Scott Wood
2010-05-22 2:51 ` hellohello
1 sibling, 1 reply; 8+ messages in thread
From: Scott Wood @ 2010-05-21 17:28 UTC (permalink / raw)
To: hellohello; +Cc: linuxppc-dev
On 05/20/2010 10:33 PM, hellohello wrote:
>> No, it shouldn't -- rx_bd_base is of type "cbd_t *", so the multiplication
>> already happens as part of pointer arithmetic.
> ---Yes, you are right. I made a basic mistake.
>
> But now I have another question.
> The SMC1 params can be relocated to any offset of the DPRAM on a 64 byte boundary, not as the SCC1, which must be at 0x8000 offset of the DPRAM.
> The SMC1 params base is set at 0x87FC offset of the DPRAM.
>
> So if I want SMC1 params start at 0x200 in DPRAM , I should set 0x200 to the 0x87FC offset of the DPRAM.
> I have see this code in u-boot, but I can not find this code in neither cpm_uart_cpm2.c nor cpm_uart_core.c.
>
> Should I add these code to cpm_uart_core.c?
Newer kernels support dynamically allocating this parameter RAM. Older
kernels use whatever u-boot chose.
Why do you want to set it to a particular address?
-Scott
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
2010-05-21 17:28 ` Scott Wood
@ 2010-05-22 2:51 ` hellohello
0 siblings, 0 replies; 8+ messages in thread
From: hellohello @ 2010-05-22 2:51 UTC (permalink / raw)
To: Scott Wood; +Cc: linuxppc-dev
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
2010-05-21 11:20 ` Gary Thomas
@ 2010-05-22 3:37 ` hellohello
0 siblings, 0 replies; 8+ messages in thread
From: hellohello @ 2010-05-22 3:37 UTC (permalink / raw)
To: Gary Thomas; +Cc: linuxppc-dev
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Problem of PowerPc 82xx when using smc
@ 2010-05-22 6:23 hellohello
0 siblings, 0 replies; 8+ messages in thread
From: hellohello @ 2010-05-22 6:23 UTC (permalink / raw)
To: hellohello, Scott Wood; +Cc: linuxppc-dev
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^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2010-05-22 6:24 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-05-20 8:58 Problem of PowerPc 82xx when using smc hellohello
2010-05-20 17:06 ` Scott Wood
2010-05-21 3:33 ` hellohello
2010-05-21 11:20 ` Gary Thomas
2010-05-22 3:37 ` hellohello
2010-05-21 17:28 ` Scott Wood
2010-05-22 2:51 ` hellohello
2010-05-22 6:23 hellohello
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