[U-Boot] [PATCH] mx51evk: Add CONFIG_REVISION_TAG

[Stefano Babic <sbabic@denx.de>]

On 18/09/2012 15:41, Beno?t Th?baudeau wrote:
> Hi Greg, Fabio,
> 
> On Tuesday, September 18, 2012 3:00:58 PM, Greg Topmiller wrote:
>> Fabio/Benoit,
>>
>> I tried the get_board_rev alone and it worked on my mx51evk.
>>
>> In the FSL u-boot version I am using the set_board_rev is:
>> static inline void set_board_rev(int rev)
>> {
>> 	system_rev |= (rev & 0xF) << 8;
>> }
>>
>> It is not called for the mx51evk but is used for mx35_3stack.
>>
>> The set_board_rev code below doesn't make sense when looking at the
>> FSL u-boot code or the main line and comparing to the mx51evk
>> schematic.  I don't see where either the FSL u-boot or the main line
>> u-boot set up iomux for GPIO0_22.  There are four pin possibilities,
>> EIM_EB2, NANDF_CS6, CSPI1_MOSI, and UART3_RXD.  On the schematic the
>> UART3_RXD is tied low so that would be the only pin to make sense in
>> this case.  To make the "set_board_rev" code below work the mx51evk
>> board specific code would have to set up the UART3_RXD to be
>> GPIO0_22 by making its function ALT3.  That being said the code
>> below would not be a problem since the if logic would most likely be
>> positive in any case and the system_rev would be or'd with board rev
>> 2.
>>
>> Let me know if you want the schematic I'm looking at.  It's a PDF.
>>
>> Best Regards,
>>
>> Greg
>>
>>
>>
>> -----Original Message-----
>> From: Fabio Estevam [mailto:festevam at gmail.com]
>> Sent: Monday, September 17, 2012 11:25 PM
>> To: Beno?t Th?baudeau
>> Cc: U-Boot-Users ML; Greg Topmiller; Stefano Babic
>> Subject: Re: [PATCH] mx51evk: Add CONFIG_REVISION_TAG
>>
>> Hi Beno?t ,
>>
>> On Mon, Sep 17, 2012 at 4:04 PM, Beno?t Th?baudeau
>> <benoit.thebaudeau@advansee.com> wrote:
>>
>>> +u32 get_board_rev(void)
>>> +{
>>> +       return get_cpu_rev();
>>> +}
>>
>> Is this enough?  Looking at FSL U-boot there is also a:
>>
>> static inline void set_board_rev(void)
>> {
>> 	if ((__REG(GPIO1_BASE_ADDR + 0x0) & (0x1 << 22)) == 0)
>> 		system_rev |= BOARD_REV_2_0 << BOARD_VER_OFFSET;
>>
>> }
>>
>> On mx53loco I had very weird problems when kernel was running and it
>> took me sometime to find out that it was due to wrong detection of
>> the board revision, so I suggest to double check this to avoid this
>> kind of problem on mx51evk too.
>>
>> Regards,
>>
>> Fabio Estevam
> 
> It looks like there is confusion between the 3stack and Babbage boards here:
> Fabio, the code you refer to in FSL U-Boot comes from the Babbage board, while
> AFAIK, the mx51evk mainline U-Boot board corresponds to the 3stack board (this
> is also FSL's naming for this board on their website).

There has been always confusion about Freescale's names.

Babbage was the internal name for the first mx51 development board. When
this board becomes available, it was referenced on Freescale's website
as "mx51evk". So babbage = mx51evk.

Best regards,
Stefano Babic

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