On 06/26/2013 02:14 AM, Scott Wood wrote:
On Tue, Mar 05, 2013 at 05:52:36PM +0200, Laurentiu TUDOR wrote:
From: Tudor Laurentiu<laurentiu.tu...@freescale.com>
The ePAPR para-virtualization needs to happen very early
otherwise the bytechannel based console will silently
drop some of the early boot messages.
Before this patch, this is how the kernel log started:
-----------------------------------------------------
> Brought up 2 CPUs
> devtmpfs: initialized
> NET: Registered protocol family 16
[...]
-----------------------------------------------------
After the patch the early messages show up:
-----------------------------------------------------
> Using P5020 DS machine description
> MMU: Supported page sizes
> 4 KB as direct
> 4096 KB as direct
[...]
-----------------------------------------------------
At console init, the kernel tried to flush the log buffer.
Since the paravirt was not yet initialized the console write
function failed silently, thus losing the buffered messages.
[snip]
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 6da881b..ce092ac 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -66,6 +66,7 @@
#include<asm/code-patching.h>
#include<asm/kvm_ppc.h>
#include<asm/hugetlb.h>
+#include<asm/epapr_hcalls.h>
#include "setup.h"
@@ -599,6 +600,8 @@ void __init setup_arch(char **cmdline_p)
/* Initialize the MMU context management stuff */
mmu_context_init();
+ epapr_paravirt_init();
+
kvm_linear_init();
/* Interrupt code needs to be 64K-aligned */
Is this early enough? There's udbg activity before this. Maybe it
should even go before udbg_early_init...
Right. I'll try moving it in machine_init().
This would require converting
the code to use the early device tree functions.
I see. Had a look at that api and it seems pretty limited.
I couldn't find a simple way of reading a property other than scanning
the entire tree with of_scan_flat_dt().
---
Best Regards, Laurentiu
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