Re: [lwip-users] ip_addr_copy alignment issue

[Ran Shalit]

Hello,

There seems to be a checksum issue that prevented a scussful ping.
(although it looked OK in wireshark)
After disabling CHECKSUM_BY_HARDWARE (for some reason it was defined)
, it works without any issues now.

Best Regards,
Ran


On Mon, Sep 25, 2017 at 10:31 AM, Wayne Uroda <address@hidden> wrote:
> Hi Ran,
>
> What about using memcpy, since it can handle unaligned access?
>
> #define ip_addr_copy(dest, src) memcpy(&((dest).addr), &((src).addr),
> sizeof((dest).addr))
>
> Maybe that would work? I am not 100% sure though.
>
> - Wayne
>
> On Mon, Sep 25, 2017 at 4:45 PM, Dirk Ziegelmeier <address@hidden>
> wrote:
>>
>> Can't help you with IAR, but maybe you can tell your processor to handle
>> unaligned access. Depending on your CPU type (following example is
>> Cortex-A9, Altera Cyclone V) your startup code may look like this (gcc asm):
>>
>> Reset_Handler:
>>         MRC     p15, 0, r0, c1, c0, 0       /* ; Read CP15 System Control
>> register */
>>         BIC     r0, r0, #(0x1 << 12)        /* ; Disable I Cache */
>>         BIC     r0, r0, #(0x1 << 11)        /* ; Disable branch predictor
>> */
>>         BIC     r0, r0, #(0x1 <<  2)        /* ; Disable D Cache */
>>         BIC     r0, r0, #(0x1 <<  1)        /* ; Disable Alignment checks
>> */
>>         BIC     r0, r0, #(0x1 <<  0)        /* ; Disable MMU     */
>>         MCR     p15, 0, r0, c1, c0, 0       /* ; Setup mode */
>>
>> Ciao
>> Dirk
>>
>> _______________________________________________
>> lwip-users mailing list
>> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/lwip-users
>
>
>
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