[U-Boot] i.MX8MM mapped register access causes crashes

[Peng Fan]

> Subject: Re: [U-Boot] i.MX8MM mapped register access causes crashes
> 
> On Wed, Jun 5, 2019 at 10:52 PM Peng Fan <peng.fan at nxp.com> wrote:
> 
> > You need to pass an arg after `md 0x302d0000`. Default it will dump a
> > lot registers, might 40 registers. It surely will crash, because there
> > are only a few registers in GPT1 which is the address you are dumping.
> 
> Other suggestion is to make sure that the clock for the peripheral you are
> trying to access is turned on.

Dump `md 0x302d0000 1` will surely work, but dump `md 0x302d0000 100`
will surely crash. The clock already on. It is that GPT1 does not have 100
registers, and trigger error when dumping non-existed registers.

Regards,
Peng