Hi all,<br><br>I am trying to use kexec with a crash dump kernel on a Maple board (Motorola ATCA6101 to be precise). This board is running a two-CPU PPC970FX. I am running a 2.6.27-10 kernel and have tried both older kexec-tools and the newest ones. I have tried SMP and non-SMP kernels.<br>
<br>Using kexec -l to fast boot works correctly. However, loading a crash dump kernel and triggering a crash via echo c > /proc/sysrq-trigger simply hangs the board. I have traced the sequence down to after the call to kexec_copy_flush(), when the CPU returns to real-address mode (bl real_mode). At this point I have no further debugging information.<br>
<br>Two things could help me:<br><br>- Getting the fix if this is a known issue and a fix exists. I have looked at recent patches and nothing lept to mind, mostly relocatable kernel support.<br>- Obtaining the address of the serial port @3f8 in real mode. The init sequence with udbg ON says that the physical address of the port is 0xf40003f8; however, setting it up in poll mode and trying to stuff characters in the tx buffer doesn't produce anything.<br>
<br>Has anyone recently tried to use the serial port in real mode ?<br><br>Thanks for any help.<br><br>Ben<br><br>