[U-Boot] [PATCH 07/12] sniper: Serial number support, obtained from die ID

[Paul Kocialkowski]

Le mardi 04 août 2015 à 14:27 -0400, Tom Rini a écrit :
> On Tue, Aug 04, 2015 at 08:22:39PM +0200, Paul Kocialkowski wrote:
> > Le mardi 04 août 2015 à 14:16 -0400, Tom Rini a écrit :
> > > On Tue, Aug 04, 2015 at 08:02:40PM +0200, Paul Kocialkowski wrote:
> > > > Le lundi 03 août 2015 à 22:08 -0400, Tom Rini a écrit :
> > > > > On Mon, Jul 20, 2015 at 03:17:13PM +0200, Paul Kocialkowski wrote:
> > > > > 
> > > > > > The OMAP3 has some die-specific ID bits that we can use to give the device a
> > > > > > (more or less) unique serial number. This is particularly useful for e.g. USB.
> > > > > > 
> > > > > > Signed-off-by: Paul Kocialkowski <contact at paulk.fr>
> > > > > > ---
> > > > > >  board/lge/sniper/sniper.c | 13 +++++++++++++
> > > > > >  1 file changed, 13 insertions(+)
> > > > > > 
> > > > > > diff --git a/board/lge/sniper/sniper.c b/board/lge/sniper/sniper.c
> > > > > > index 44d422d..f26855d 100644
> > > > > > --- a/board/lge/sniper/sniper.c
> > > > > > +++ b/board/lge/sniper/sniper.c
> > > > > > @@ -70,7 +70,9 @@ int board_init(void)
> > > > > >  
> > > > > >  int misc_init_r(void)
> > > > > >  {
> > > > > > +	char serial_string[17] = { 0 };
> > > > > >  	char reboot_mode[2] = { 0 };
> > > > > > +	u32 dieid[4] = { 0 };
> > > > > >  
> > > > > >  	/* Reboot mode */
> > > > > >  
> > > > > > @@ -82,6 +84,17 @@ int misc_init_r(void)
> > > > > >  		omap_reboot_mode_clear();
> > > > > >  	}
> > > > > >  
> > > > > > +	/* Serial number */
> > > > > > +
> > > > > > +	get_dieid((u32 *)&dieid);
> > > > > > +
> > > > > > +	if (!getenv("serial#")) {
> > > > > > +		snprintf(serial_string, sizeof(serial_string),
> > > > > > +			"%08x%08x", dieid[0], dieid[3]);
> > > > > > +
> > > > > > +		setenv("serial#", serial_string);
> > > > > > +	}
> > > > > > +
> > > > > >  	return 0;
> > > > > >  }
> > > > > 
> > > > > Shouldn't this be in more generic code so everyone gets this set now?
> > > > > Thanks!
> > > > 
> > > > Well, we had a similar discussion for sunxi, and the outcome was that
> > > > serial number could be obtained from other places on other devices (e.g.
> > > > EEPROM) or be calculated from the dieid bits in a different way, so I
> > > > prefer to keep this board-specific instead of omap3-generic for now.
> > > > 
> > > > This merely matches what is done on Android OMAP devices, but one could
> > > > do it another way, too.
> > > > 
> > > > What do you think?
> > > 
> > > I think, ug,
> > > arch/arm/cpu/armv7/omap-common/utils.c::usb_set_serial_num_from_die_id()
> > > should be called set_serial_num_from_die_id() and we can use that for
> > > this board too even if it's not ideal.
> > 
> > Oh okay then, I don't have any problem with making this code common,
> > especially if it's not called by every omap3 board then.
> > 
> > I agree with your proposal. Should I submit a v2 with a patch in that
> > direction?
> 
> Sounds good, thanks!

Taking a closer look at things, it appears that various (non-omap3)
boards are grabbing the Die ID bits on their own and then calling those
functions (usb_fake_mac_from_die_id, usb_set_serial_num_from_die_id).

IMHO, we should have a common naming scheme for the function to get the
dieid (omap_dieid), define that for each omap platform and have it
called in omap-common code (with one function for the serial number and
one for the fake mac), just like what I did with omap_sys_boot_device.

Then, each board would simply call those functions directly, without
having to care about how to obtain the die id bits.

This seems like a series that would deserve to live on its own, so I
suggest that you merge Optimus Black support as-is for now and I'll
submit another series to implement that behaviour on top.

What do you think?

-- 
Paul Kocialkowski, Replicant developer

Replicant is a fully free Android distribution running on several
devices, a free software mobile operating system putting the emphasis on
freedom and privacy/security.

Website: http://www.replicant.us/
Blog: http://blog.replicant.us/
Wiki/tracker/forums: http://redmine.replicant.us/
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