[U-Boot] ls1021a: problem with errata A009007

[Heiko Schocher]

Hello Ran Wang,

Am 12.07.2018 um 10:04 schrieb Ran Wang:
> Hi Heiko,
> 
>> -----Original Message-----
>> From: Heiko Schocher [mailto:hs at denx.de]
>> Sent: Thursday, July 12, 2018 13:44
>> To: Ran Wang <ran.wang_1 at nxp.com>
>> Cc: Sriram Dash <sriram.dash at nxp.com>; Rajesh Bhagat
>> <rajesh.bhagat at nxp.com>; Suresh Gupta <suresh.bhagat at nxp.com>; u-
>> boot at lists.denx.de
>> Subject: ls1021a: problem with errata A009007
>>
>> Hello Ran Wang,
>>
>> I have ported successfully U-Boot to an ls1021a based board and works nice
>> for the HW I have access to.
>>
>> Now the customer reports problems on his HW with
>> SYS_FSL_ERRATUM_A009007
>> which is always activated.
>>
>> Board does not boot, and crashes in erratum_a009007()
>>
>> (Sorry I have no logs ... nor access to this HW)
>>
>> Disabling this function, and U-Boot boots ...
>>
>> Customer states/confirmed me, that he has the same HW ...
>>
>> On the board USB is not used.
>>
>> Any ideas hints what can be wrong here?
>>
> I just re-reverified on  latest upstream U-Boot with LS1021ATWR board. It worked fine.
> You might need to know what kind of crash they encountered:

I am sorry ... no debugger there ...

> 1. That erratum workaround programming will happen before the UART print activated, that means
> no log will show when writing those register, how does then know the crash?

Good question ... they removed the erratum_a009007() function, and
SPL / U-Boot booted fine ... but I think currently, the HW is bogus ...
I cannot verify this with the HW i have ...

> 2.  Except erratum programming, USB controller (xHCI) will NOT be initialized untill U-Boot command 'usb start'
> is executed. That means if user didn't type 'usb start', USB IP will not begin to work at all.

Yes, and on the board USB is not used at all...

> 3. Anyway, this erratum is used to pass USB compliance test only, you could disable this workaround
> on your board if you don't any USB issue on normal use case, I think it's fine.

Thanks for your clarification!

bye,
Heiko
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