Re: [Xen-devel] Dom0 kernel for Xen4.6 on R-Car H2 (LAGER)

["Ferger, Max" <M.Ferger@xxxxxxxxxx>]

Hi!

I'm sorry, but that didn't do the trick.
Neither did trying, whether a compressed or non-compressed dom0 image would do.

Also, I tried:
----- 8< -----
/chosen/xen,dom0-bootargs = "console=hvc0 earlyprintk=xen debug ignore_loglevel 
vmalloc=384M video=HDMI-A-1:1920x1080-32@60 
ip=192.168.0.5:192.168.0.15:192.168.0.15:255.255.255.0:lager:eth0::: 
root=/dev/nfs rw nfsroot=192.168.0.15:/nfsroot rootdelay clk_ignore_unused";
----- 8< -----
+ earlyprintk=xen
- rootwait
+ rootdelay

The log remains the same: empty from the switch to Dom0 onwards.

Many thanks so far!  Maybe there are some more investigative options to check 
or try out?

Max Ferger

-----Ursprüngliche Nachricht-----
Von: Julien Grall [mailto:julien.grall@xxxxxxxxxx] 
Gesendet: Mittwoch, 21. Oktober 2015 18:23
An: Ferger, Max <M.Ferger@xxxxxxxxxx>; Ian Campbell <ian.campbell@xxxxxxxxxx>; 
xen-devel@xxxxxxxxxxxxx
Cc: Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>; Iurii 
Konovalenko <iurii.konovalenko@xxxxxxxxxxxxxxx>
Betreff: Re: [Xen-devel] Dom0 kernel for Xen4.6 on R-Car H2 (LAGER)

On 21/10/15 17:05, Ferger, Max wrote:
> Hi!

Hello,

> Thanks for both DT fixes, the "add ranges;", and the "complete memory map".
> 
> Here are some findings:
> 
> * Linus' most recent version of the kernel [1] (configured with a mix of 
> Xen/OMAP description [2] and lager_defconfig [3]) needs the 'add 
> "ranges;"'-fixes, but does not access the otherwise unmapped address regions.
> * Renesas' Yocto/Poky
> 
> Unfortunately, neither gives any message on the console, so I don't know 
> their status.
> 
> [1] git clone 
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> [2] 
> http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions
> /OMAP5432_uEVM [3] git clone 
> https://github.com/renesas-devel/lager-config
> 
> As I see it, Xen issues no further warnings, but still Dom0 remains silent.

The console parameter in "xen,dom0-bootargs" seems to be wrong.
It should be console=hvc0

If it still doesn't work, you can apply the patch [1] to Linux (it's based on 
the latest version). It will print everything on Xen console even if the HVC 
console is not ready.

> I'm somewhat at a loss.  :-(
> 
> Greetings from Germany!

Regards,


[1]
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index 
fa816b7..b57ace0 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -638,7 +638,7 @@ void xen_raw_console_write(const char *str)
        ssize_t len = strlen(str);
        int rc = 0;
 
-       if (xen_domain()) {
+       if (1 || xen_domain()) {
                rc = dom0_write_console(0, str, len);  #ifdef CONFIG_X86
                if (rc == -ENOSYS && xen_hvm_domain()) diff --git 
a/kernel/printk/printk.c b/kernel/printk/printk.c index 8f0324e..29a19af 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1652,6 +1652,8 @@ static size_t cont_print_text(char *text, size_t size)
        return textlen;
 }
 
+#include <xen/hvc-console.h>
+
 asmlinkage int vprintk_emit(int facility, int level,
                            const char *dict, size_t dictlen,
                            const char *fmt, va_list args) @@ -1719,6 +1721,7 
@@ asmlinkage int vprintk_emit(int facility, int level,
         * prefix which might be passed-in as a parameter.
         */
        text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
+       xen_raw_console_write(text);
 
        /* mark and strip a trailing newline */
        if (text_len && text[text_len-1] == '\n') {




--
Julien Grall



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