Hi everyone I am helping a friend port the kernel to a new board that he has built with a PMC R5231A cpu. The system controller is a custom design (it has a standard 16550A uart and the interrupts are directly routed to the cpu). I am currently working off linux_2_4_21 checked out from CVS. Following the instructions from Jun Sun (http://linux.junsun.net/porting-howto/) I get to the following point where things seem to break - ----------------------------------------------------------- CPU revision is: 00002831 FPU revision is: 00002830 Primary instruction cache 32kB, physically tagged, 2-way, linesize 32 bytes. Primary data cache 32kB 2-way, linesize 32 bytes. Linux version 2.4.21 (naren@laptop) (gcc version 2.95.4 20010319 (prerelease)) 3 Determined physical RAM map: memory: 04000000 @ 00000000 (usable) Initial ramdisk at: 0x80276000 (1765376 bytes) On node 0 totalpages: 16384 zone(0): 16384 pages. zone(1): 0 pages. zone(2): 0 pages. Kernel command line: console=ttyS0,115200 kgdb=ttyS0,115200 ramdisk_size=8192 root=/dev/ram* Calibrating delay loop... 748.74 BogoMIPS Memory: 61092k/65536k available (705k kernel code, 4444k reserved, 1848k data, ) Dentry cache hash table entries: 8192 (order: 4, 65536 bytes) Inode cache hash table entries: 4096 (order: 3, 32768 bytes) Mount cache hash table entries: 512 (order: 0, 4096 bytes) Buffer-cache hash table entries: 4096 (order: 2, 16384 bytes) Page-cache hash table entries: 16384 (order: 4, 65536 bytes) Checking for 'wait' instruction... available. POSIX conformance testing by UNIFIX Linux NET4.0 for Linux 2.4 Based upon Swansea University Computer Society NET3.039 Starting kswapd pty: 256 Unix98 ptys configured Serial driver version 5.05c(2001-07-08) with no serial options enabled Generic MIPS RTC Driver v1.0 RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize loop: loaded (max 8 devices) RAMDISK: Compressed image found at block 0 Freeing initrd memory: 1724k freed VFS: Mounted root (ext2 filesystem) readonly. Freeing unused kernel memory: 48k freed EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended ------------------------------------------------------- I am using the big-endian ramdisk from the debian mips distribution for test purposes. However I do not get to any sort of console prompt. The system just seems to hang at that point. (Using the QED ITE board, I get to the point where the debian setup starts.) The toolchain used to build the kernel is the mips-linux toolchain from ftp.linux-mips.org- Reading specs from /usr/lib/gcc-lib/mips-linux/2.95.4/specs gcc version 2.95.4 20010319 (prerelease) Trying to debug using kgdb, I can break right before the execve of /sbin/init. However I cannot step or debug beyond that point. (Using gdb 5.3 built with target=mips-linux). So I know that I get to the exec of init. However beyond that I do not know what is happening. Using printks I determined that the system at least enters load_elf_binary. Anyone have any ideas where I can look for what is going wrong? Also I am wondering why I cannot use gdb to step into execve? I followed the porting guide instructions in order to set up kgdb. I can break and step before the call to init but nothing after that. Thanks a lot for any help Naren Sankar
