[U-Boot] i.MX6 boot mode on SRC_SBMR1

[Troy Kisky]

On 5/11/2015 3:24 AM, Palacios, Hector wrote:
> Hello Troy,
> 
> Code comments on commit 124a06d7fbbf82f47304d499418460312a725ad6 for forcing the boot mode say:
> 
> +/*
> + * cfg_val will be used for
> + * Boot_cfg4[7:0]:Boot_cfg3[7:0]:Boot_cfg2[7:0]:Boot_cfg1[7:0]
> + * After reset, if GPR10[28] is 1, ROM will copy GPR9[25:0]
> + * to SBMR1, which will determine the boot device.
> + */
> 
> 
> Although this works (the ROM boots from the media configured in GPR9[25:0] if GPR10[28] is set), the value of SBMR1 does not really change, as the comment says, and is still the one read by the strapping.
> 
> I didn't find this documented on the HRM. Where did you find it?
> 
> Thanks
> --
> Héctor Palacios
> 
> 
In source code from a boot shim from freescale.