Hello list I am trying to bring up MPC8349EMDS board with linux-2.6.18 kernel with ramfs enabled. I am passing a device tree binary (dtb) compiled from the corresponding dts file found from the 'arch/powerpc/boot/dts' directory and compiled with the device tree compiler. I found that the IRQ lines assigned to different peripherals are completely wrong. My serial ports are connected to pin 9 and 10, but in this kernel the IRQs assigned are 16 and 17.
On a little investigation I found that the base address assigned to the IPIC chip is '0xFDDFB700' If I compile the linux version with 'ARCH=ppc' and boot then my IPIC base address is getting assigned as 0xFE000700, which I think is the correct behaviour. I checked in the dts file and found that the IPIC offset is mentioned as 700 and size as 100, which are correct as per the manual. Even the IRQ lines mentioned for the Serial ports in the DTS are '9' and 'A'. Does this wrong assignment is due to the wrong base address of the IPIC chip? With IRQs 16 and 17, how the serial console is working fine? When I tried hard coding the IPIC base value to '0xfe000700' then the system refuses to boot up. I kept the IPIC base as 0xfddfb700 and hard coded the irq lines for serial ports as 9 and 10 and in that case the 'request_irq' call fails with the error number as '-38', which translates to '-ENOSYS'. The changes in the dts never gets reflected in the kernel, no matter what lines I set for serial line in the dts, the request always goes for line 16 and 17. Please let me know if you need any more information regarding the same. Any help in this will be highly appreciated. Thanks Biswa The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
