Hello, Benoît, On Fri, Dec 13, 2013 at 4:52 AM, Benoît Thébaudeau <[email protected]> wrote: > On Thursday, December 12, 2013 5:46:21 PM, Sergey Alyoshin wrote: >> Enable fuse supply gate before fuse programming and disable after. >> >> Signed-off-by: Sergey Alyoshin <[email protected]> >> Tested-by: Sergey Alyoshin <[email protected]> > > Have you also tested without this patch first too? On which SoC?
I have tried to write MAC address in fuse (bank 1) on i.MX53 custom board and 'fuse sense' show no change, reboot show no change either. I have not tested this on i.MX51, but this register and bit is the same on i.MX51 with exactly the same description. With this patch I have successfully written MAC addresses on several i.MX53 boards. In Linux 2.6.35 from Freescale this bit is also set for fuse programming, e.g. in arch/arm/mach-mx5/mx51_babbage.c and arch/arm/mach-mx5/mx53_loco.c in mxc_iim_enable_fuse(). > My tests had shown that this is not required on i.MX51. It's probably the same > on i.MX53. I have not checked if i.MX25 and i.MX35 also have such a bit, but > they also work fine as is. This is not even done by Freescale: > http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/drivers/char/mxc_iim.c?h=imx_3.0.35_4.1.0 > > In the Reference Manual, nothing says in the IIM / fuse chapters that this bit > is needed for proper programming. It is just described in the CCM register > map, > and nothing refers to it. It is perhaps only useful for test purposes. I'd > vote > for letting this bit untouched if possible. > > Fabio, do you have more information from Freescale about this bit? _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
