[U-Boot-Users] Motorola PPC827x
Yuli, I have a PQ2FADS_VR ( ppc8275 ) board from motorola which has a 66000000 Hz clock. Is it worthwhile to insert this anomaly to the u-boot code? I have done changes in MPC8260ADS.h file in order to make it run for me.
Regards // Matias -------------------------------------------------------------------------------
Matias Sundman writes:
Matias> Hi Yuli, I am not sure if I have understood the file Matias> structure of U-boot. I downloaded U-boot-0.4.0, but I cant Matias> find ppc8270 under the CPU folder, nor can I find the Matias> PQ2FADS board under the board folder...
Matias> Can you explain me where the code for PPC8270 resides in the Matias> file structure?
First of all, download the latest version from CVS (0.4.7 or CVS HEAD).
Differences between 8260 and 8270 do not justify creating a separate CPU directory. In fact, all the differences result in some 10-20 lines of code, so look at cpu/mpc8260. Use `grep' to find HiP7 and you'll see the changes I made to support 8270/75/80. The same is true for PQ2FADS. I ported U-Boot to this board but since it's very similar to older MPC8260ADS I modified existing port to support all Motorola evaluation boards (MPC8260ADS/MPC8266ADS/PQ2FADS). Some differences are handled by #ifdefs. Cloning an existing port and changing ten lines to support new board as it's done in many cases creates maintenance nightmare. So the right place to look is board/mpc8260ads. BTW, I think it's mentioned in README.
Hope this helps,
Matias Sundman writes:
Matias> I have a PQ2FADS_VR ( ppc8275 ) board from motorola which has a 66000000 Hz clock. Matias> Is it worthwhile to insert this anomaly to the u-boot code? I have done changes Matias> in MPC8260ADS.h file in order to make it run for me.
What do you mean by "anomaly"? If the only thing you had to change is clock frequency, I'd say it's OK. My MPC8260ADS board, for example, uses 40MHz clock so I too have to change the default value. I tried to set default values to the frequencies of the oscillators the boards are shipped with. MPC826xADS are shipped with 66MHz clock while PQ2FADS-ZU is shipped with 100MHz. PQ2FADS-VR is shipped with 66MHz clock because VR chips are limited to 66MHz frequency. It's the only difference between ZU and VR boards. Do you think we have to create additional CFG_ADSTYPE for VR boards to handle this difference? Changing clock in MPC8260ADS.h looks simpler. -- ================================================================== ====== Yuli Barcohen | Phone +972-9-765-1788 | Software Project Leader yuli@arabellasw.com | Fax +972-9-765-7494 | Arabella Software, Israel ================================================================== ======
participants (2)
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Matias Sundman (AL/EAB) -
Yuli Barcohen