[U-Boot-Users] mvbc_p board: build warnings
André Schwarz
andre.schwarz at matrix-vision.de
Thu Jul 31 19:34:39 CEST 2008
Wolfgang,
thanks - I'll fix it on monday/tuesday and send a patch after testing
the -rc2.
regards,
André
Wolfgang Denk schrieb:
> Hi,
>
> I'm trying to clean up the build warnings for the mvbc_p board.
> I've succeded with all but this one:
>
> mvbc_p.c: In function 'mvbc_init_gpio':
> mvbc_p.c:124: warning: dereferencing type-punned pointer will break strict-aliasing rules
>
> This relates to the following code:
>
> 115 out_be32(&gpio->simple_ddr, SIMPLE_DDR);
> 116 out_be32(&gpio->simple_dvo, SIMPLE_DVO);
> 117 out_be32(&gpio->simple_ode, SIMPLE_ODE);
> 118 out_be32(&gpio->simple_gpioe, SIMPLE_GPIOEN); <== volatile u8 outo_gpioe;
> 119
> 120 out_be32((u32*)&gpio->sint_ode, SINT_ODE); <== volatile u8 sint_ode;
> 121 out_be32((u32*)&gpio->sint_ddr, SINT_DDR); <== volatile u8 sint_ddr;
> 122 out_be32((u32*)&gpio->sint_dvo, SINT_DVO); <== volatile u8 sint_dvo;
> 123 out_be32((u32*)&gpio->sint_inten, SINT_INTEN); <== volatile u8 sint_inten;
> 124 out_be32((u32*)&gpio->sint_itype, SINT_ITYPE); <== volatile u16 sint_itype;
> 125 out_be32((u32*)&gpio->sint_gpioe, SINT_GPIOEN); <== volatile u8 outo_gpioe;
>
>
> I don't know why the warning is only issued for the "u16" type and
> not also for the "u8" ones, but anyway: Is the casting to "u32*" and
> using out_be32() here really correct?
>
> I would expect to see some out_be8() and one out_be16() here?
>
> Best regards,
>
> Wolfgang Denk
>
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