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Supporting two boards which are almost similar

U-Boot Sudhakar Rajashekhara 2 participants 4 messages Jun 25, 2010 – Jul 23, 2010

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Sudhakar Rajashekhara

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#0 lore raw

Hi,

Spectrum digital has two versions of DM6467 EVM, DM6467 and DM6467T. Though there are some video related differences between these two boards, from U-Boot perspective the only difference the developer need to worry is the different oscillator frequency. DM6467 has 27MHz crystal but DM6467T has 33MHz crystal. Both these EVMs are registered as two different boards in mach-types.h. Existing U-Boot has support DM6467 EVM which has 27MHz crystal. How should I go about adding support for DM6467T EVM which has 33MHz crystal? Do I need to add a new configuration file for this or can I make use of the existing configuration file in any way?

One method I was aware of was, using some scripting from the top level Makefile but I believe this is not recommended.

Thanks in advance,
Sudhakar

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#1 lore raw

Hi,

Quoted 12 lines · Sudhakar Rajashekhara

Hi,

Spectrum digital has two versions of DM6467 EVM, DM6467 and DM6467T. Though there are some video related differences between these two boards, from U-Boot perspective the only difference the developer need to worry is the different oscillator frequency. DM6467 has 27MHz crystal but DM6467T has 33MHz crystal. Both these EVMs are registered as two different boards in mach-types.h. Existing U-Boot has support DM6467 EVM which has 27MHz crystal. How should I go about adding support for DM6467T EVM which has 33MHz crystal? Do I need to add a new configuration file for this or can I make use of the existing configuration file in any way?

Quoted 3 lines

One method I was aware of was, using some scripting from the top level Makefile but I believe this is not recommended.

Any other method of achieving this?

Regards,
Sudhakar

#2 lore raw

Hi Sudhakar,

Quoted 13 lines · Sudhakar Rajashekhara
Quoted 12 lines

Hi,

Spectrum digital has two versions of DM6467 EVM, DM6467 and DM6467T. Though there are some video related differences between these two boards, from U-Boot perspective the only difference the developer need to worry is the different oscillator frequency. DM6467 has 27MHz crystal but DM6467T has 33MHz crystal. Both these EVMs are registered as two different boards in mach-types.h. Existing U-Boot has support DM6467 EVM which has 27MHz crystal. How should I go about adding support for DM6467T EVM which has 33MHz crystal? Do I need to add a new configuration file for this or can I make use of the existing configuration file in any way?

Quoted 5 lines
Quoted 3 lines

One method I was aware of was, using some scripting from the top level Makefile but I believe this is not recommended.

Any other method of achieving this?

Actually I'm just in the process of answering your question. My immediate response would have been "use -t for mkconfig" but this does not (yet) work for boards.cfg versions. So I'm just in the process of testing a mkconfig extension to allow for similar handling of "BOARD_OPTION1_OPTION2" configurations which will be split into 'CONFIG_MK_{BOARD,OPTION1,OPTION2}' defines.

When we have this, we can use a common config file and use #ifdefs for these CONFIG_MK defines.

Stay tuned
Detlev

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#3 lore raw

Hi Detlev,

Quoted 28 lines · Detlev Zundel

Hi Sudhakar,

Quoted 13 lines · Sudhakar Rajashekhara
Quoted 12 lines

Hi,

Spectrum digital has two versions of DM6467 EVM, DM6467 and DM6467T. Though there are some video related differences between these two boards, from U-Boot perspective the only difference the developer need to worry is the different oscillator frequency. DM6467 has 27MHz crystal but DM6467T has 33MHz crystal. Both these EVMs are registered as two different boards in mach-types.h. Existing U-Boot has support DM6467 EVM which has 27MHz crystal. How should I go about adding support for DM6467T EVM which has 33MHz crystal? Do I need to add a new configuration file for this or can I make use of the existing configuration file in any way?

Quoted 5 lines
Quoted 3 lines

One method I was aware of was, using some scripting from the top level Makefile but I believe this is not recommended.

Any other method of achieving this?

Actually I'm just in the process of answering your question. My immediate response would have been "use -t for mkconfig" but this does not (yet) work for boards.cfg versions. So I'm just in the process of testing a mkconfig extension to allow for similar handling of "BOARD_OPTION1_OPTION2" configurations which will be split into 'CONFIG_MK_{BOARD,OPTION1,OPTION2}' defines.

Quoted 5 lines

When we have this, we can use a common config file and use #ifdefs for these CONFIG_MK defines.

Stay tuned
Detlev

Were you able to do any further investigation on this? I can take up some testing, if that helps?

Thanks,
Sudhakar