On Monday 02 February 2009 16:04:34 Wolfgang Denk wrote: > In message Mike Frysinger you wrote: > > ------- > > Usage > > ------- > > > > During board init (like the board-specific misc_init_r() function), > > boards should take care of locating the MAC address, initializing the > > environment, and seeding the global data. > > Please change: > > If the hardware design mandates that the MAC address is stored > in some special place, like EEPROM etc., then the board > specific init code (like the board-specific misc_init_r() > function) is responsible for locating the MAC address(es) and > initialize the respective environment variable(s) from it. > > Note that this shall be done if, and only if, the environment > does not already contain these environment variables, i. e. > existing variable definitions must not be overwritten. > > The envrionment handling code (function setevn()) will update > the global data accordingly.
it will update the global data, but nowhere will it initially seed it. i'm
thinking env_init() should be a unified entry point that first calls down to
the specific env storage (eeprom/flash/nand/etc...) and then initializes the
relevant bi_enetaddr members of the global data structure.
> > During runtime, the ethernet layer will use the environment variables to
> > sync the MAC addresses to the ethernet structures. All ethernet driver
> > code should then only use the enetaddr member of the eth_device
> > structure.
>
> Please change:
>
> During runtime, the ethernet layer will use the global data
> to sync ...
documenting it this way wont change the code ;). the ethernet code does not
use the global data in any way. look at eth_initialize() in net/eth.c. i
imagine part of the reason for this is that working with multiple ethernet
devices is pretty ugly atm. the static list of CONFIG_HAS_ETH{1,2,3,...}
makes working with more than one device very messy. the ethernet code today
though builds the string dynamically "eth%iaddr" and so can handle arbitrary
number of devices without needing any changes.
this also applies to the cascading of setenv() into the global data. that
code only handles bi_enetaddr and none of the bi_enetNaddr ... doing 'set
eth1addr ..." will not update bi_enet1addr ...
> > Any other common code that wishes to access the MAC address should then
> > query the global data directly. No one should be looking in the
> > environment for any addresses.
>
> Any code that wishes to access the MAC address should then query the
> global data or the environment, depending on whatever (binary or
> string representation) seems more appropriate.
relying on global data only means code can avoid having to handle unset
variables. global data will always have something in there. the
str_enetaddr() utility function makes this easy ...
> > * bool eth_getenv_enetaddr(char *name, uchar *enetaddr);
>
> Make this "int" - we don't use "bool" in U-Boot. This is C code.
bool is a C type ... not that i'll bitch enough to keep it :p
i've merged your other changes locally
-mike
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