jkh weird problem (reading pci device memory)

[Niki Denev]

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John Baldwin wrote:
> On Saturday 05 August 2006 10:06, Niki Denev wrote:
>> 	for(i=0; i < sizeof(config_table_t); i++) {
>> 		r =  bus_space_read_1(sc->bar.tag, sc->bar.hdl, i);
>> 		*((u_int8_t *)&sc->cfg_table + i) =  r;
>> 		}
> 
> Note that you can replace this with:
> 
> 	bus_space_read_multi_1(sc->bar.tag, sc->bar.hdl, 0,
> 	    (u_int8_t *)&sc->cfg_table, sizeof(config_table_t));
> 

I can't understand why the code above gives me different results.
i.e.:

	for(i=0; i < sizeof(config_table_t); i++) {
		*((u_int8_t *)&sc->cfg_table + i) =  bus_read_1(sc->res, i);
	}
	printf("cfg_table signature : %08X\n", sc->cfg_table.signature);

This prints : cfg_table signaature 0xEFEFFEFE, which is the correct signature
that should be read from the card.

But this code :

	bus_read_multi_1(sc->res, 0, (u_int8_t *)&sc->cfg_table, sizeof(config_table_t));
	printf("cfg_table signature : %08X\n", sc->cfg_table.signature);

prints : cfg_table signature 0xFEFEFEFE
which is not correct...

Shouldn't the above examples do exactly the same thing?


- --niki
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