Hi everybody, I'm trying to port the Linux kernel (2.6.15.1) to the Embedded Planet 8248 board. The board has a proprietary boot loader and uses SMC1 has a serial console.
After some work (2.6.15.1 has a nasty bug related to relocation which has been fixed in the git tree), I have been able to load and start the kernel image. Unfortunately, the early serial output is lost. Here is the kernel boot messages I get with 2.6.15.1 : ----------------------------------------------------------------------------- Embedded Planet EP8248 PowerPC port Built 1 zonelists Kernel command line: console=ttyCPM0,9600n8 root=/dev/ram0 rw PID hash table entries: 4096 (order: 12, 65536 bytes) Warning: real time clock seems stuck! Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 777088k available (1520k kernel code, 440k data, 96k init, 0k highmem) Mount-cache hash table entries: 512 NET: Registered protocol family 16 ----------------------------------------------------------------------------- And here is the same with the modified 2.6.10-pre3 kernel shipped with the board: ----------------------------------------------------------------------------- loaded at: 00200000 002D01E8 relocated to: 00400000 004D01E8 board data at: 004CE12C 004CE168 relocated to: 0040509C 004050D8 zimage at: 00405A31 004CD2C4 avail ram: 004D1000 01000000 Linux/PPC load: console=ttyCPM0,9600n8 root=/dev/ram0 rw Uncompressing Linux...done. Now booting the kernel Linux version 2.6.10-rc3 (laurent at pclaurent) (gcc version 3.4.1) #5 Thu Jan 19 15:25:42 CET 2006 Embedded Planet EP8248 PowerPC port Built 1 zonelists [...] ----------------------------------------------------------------------------- Early boot messages (printed with puts in ppc/boot/simple/misc-embedded.c) are lost. I compared the Embedded Planet kernel with the 2.6.10-rc3 from kernel.org, haven't seen any big change related to the SMC serial port. Embedded Planet uses BRGC7 instead of BRGC1 for SMC1, but that didn't work better for me. I of course enabled the RS232 transceivers in the board control and status registers (BCSR). Could anyone give me any pointer to where I should look at ? Thanks in advance, Laurent Pinchart
