Hello, I am trying to port Linux to MIPS-based platform with custom bootloader. I need to pass command line, initrd, and some parameters such as memory size to kernel (preferably via device tree). The devicetree is built/modified in bootloader, so I cannot embed it in kernel. Please correct me if I am wrong: - I think there is no standard for passing data to kernel, just some firmwares use a0/a1 for argv/argc (in fw_init_cmdline). - there is no standard for passing device tree on MIPS (does U-Boot support this on MIPS? How?) - the only way how to pass address/size of initramfs/initrd is via commandline parameters (rd_start, rd_size) What I would like to do is to pass initrd, device tree and commandline to kernel. For example PowerPC has the following arguments on kernel start which perfectly matches my needs: 51 * r3: ptr to board info data 52 * r4: initrd_start or if no initrd then 0 53 * r5: initrd_end - unused if r4 is 0 54 * r6: Start of command line string 55 * r7: End of command line string Unfortunately MIPS ABI allows only a0..a3 (+stack arguments which is of no use in this case) so I'll have to use either some sort of memory structure (such as ATAGs used in ARMLinux/Android) or pass devicetree address via register or commandline. I would prefer ATAG-like method as it's much cleaner than other methods. Any comments on this are welcome. I do not want to re-invent wheel. Thank you, Martin
