* [RFC PATCH] icecube/lite5200b: fix OF_TBCLK (timebase-frequency) calculation
@ 2007-03-07 7:02 ` Domen Puncer
0 siblings, 0 replies; 4+ messages in thread
From: Domen Puncer @ 2007-03-07 7:02 UTC (permalink / raw)
To: u-boot-users; +Cc: linuxppc-embedded
I tracked jiffies (on Linux) incrementing twice as fast on
lite5200b to this ("timebase-frequency" property).
G2 core reference manual says decrementer and time base
are decreasing/increasing once every 4 bus clock cycles.
Was there a reason this was busfreq/8?
Domen
---
include/configs/IceCube.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: u-boot.git/include/configs/IceCube.h
===================================================================
--- u-boot.git.orig/include/configs/IceCube.h
+++ u-boot.git/include/configs/IceCube.h
@@ -182,7 +182,7 @@
#define OF_CPU "PowerPC,5200@0"
#define OF_SOC "soc5200@f0000000"
-#define OF_TBCLK (bd->bi_busfreq / 8)
+#define OF_TBCLK (bd->bi_busfreq / 4)
#define OF_STDOUT_PATH "/soc5200@f0000000/serial@2000"
/*
^ permalink raw reply [flat|nested] 4+ messages in thread* [U-Boot-Users] [RFC PATCH] icecube/lite5200b: fix OF_TBCLK (timebase-frequency) calculation
@ 2007-03-07 7:02 ` Domen Puncer
0 siblings, 0 replies; 4+ messages in thread
From: Domen Puncer @ 2007-03-07 7:02 UTC (permalink / raw)
To: u-boot
(sorry if you receive this twice, MTA issues)
I tracked jiffies (on Linux) incrementing twice as fast on
lite5200b to this ("timebase-frequency" property).
G2 core reference manual says decrementer and time base
are decreasing/increasing once every 4 bus clock cycles.
Was there a reason this was busfreq/8?
Domen
---
include/configs/IceCube.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: u-boot.git/include/configs/IceCube.h
===================================================================
--- u-boot.git.orig/include/configs/IceCube.h
+++ u-boot.git/include/configs/IceCube.h
@@ -182,7 +182,7 @@
#define OF_CPU "PowerPC,5200 at 0"
#define OF_SOC "soc5200 at f0000000"
-#define OF_TBCLK (bd->bi_busfreq / 8)
+#define OF_TBCLK (bd->bi_busfreq / 4)
#define OF_STDOUT_PATH "/soc5200 at f0000000/serial at 2000"
/*
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [RFC PATCH] icecube/lite5200b: fix OF_TBCLK (timebase-frequency) calculation
2007-03-07 7:02 ` [U-Boot-Users] " Domen Puncer
@ 2007-03-07 16:25 ` Grant Likely
-1 siblings, 0 replies; 4+ messages in thread
From: Grant Likely @ 2007-03-07 16:25 UTC (permalink / raw)
To: Domen Puncer; +Cc: u-boot-users, linuxppc-embedded
On 3/7/07, Domen Puncer <domen.puncer@telargo.com> wrote:
> I tracked jiffies (on Linux) incrementing twice as fast on
> lite5200b to this ("timebase-frequency" property).
>
> G2 core reference manual says decrementer and time base
> are decreasing/increasing once every 4 bus clock cycles.
>
> Was there a reason this was busfreq/8?
Simply sloppyness on my part.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
>
>
> Domen
> ---
> include/configs/IceCube.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: u-boot.git/include/configs/IceCube.h
> ===================================================================
> --- u-boot.git.orig/include/configs/IceCube.h
> +++ u-boot.git/include/configs/IceCube.h
> @@ -182,7 +182,7 @@
>
> #define OF_CPU "PowerPC,5200@0"
> #define OF_SOC "soc5200@f0000000"
> -#define OF_TBCLK (bd->bi_busfreq / 8)
> +#define OF_TBCLK (bd->bi_busfreq / 4)
> #define OF_STDOUT_PATH "/soc5200@f0000000/serial@2000"
>
> /*
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
--
Grant Likely, B.Sc. P.Eng.
Secret Lab Technologies Ltd.
grant.likely@secretlab.ca
(403) 399-0195
^ permalink raw reply [flat|nested] 4+ messages in thread* [U-Boot-Users] [RFC PATCH] icecube/lite5200b: fix OF_TBCLK (timebase-frequency) calculation
@ 2007-03-07 16:25 ` Grant Likely
0 siblings, 0 replies; 4+ messages in thread
From: Grant Likely @ 2007-03-07 16:25 UTC (permalink / raw)
To: u-boot
On 3/7/07, Domen Puncer <domen.puncer@telargo.com> wrote:
> I tracked jiffies (on Linux) incrementing twice as fast on
> lite5200b to this ("timebase-frequency" property).
>
> G2 core reference manual says decrementer and time base
> are decreasing/increasing once every 4 bus clock cycles.
>
> Was there a reason this was busfreq/8?
Simply sloppyness on my part.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
>
>
> Domen
> ---
> include/configs/IceCube.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: u-boot.git/include/configs/IceCube.h
> ===================================================================
> --- u-boot.git.orig/include/configs/IceCube.h
> +++ u-boot.git/include/configs/IceCube.h
> @@ -182,7 +182,7 @@
>
> #define OF_CPU "PowerPC,5200 at 0"
> #define OF_SOC "soc5200 at f0000000"
> -#define OF_TBCLK (bd->bi_busfreq / 8)
> +#define OF_TBCLK (bd->bi_busfreq / 4)
> #define OF_STDOUT_PATH "/soc5200 at f0000000/serial at 2000"
>
> /*
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded at ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
--
Grant Likely, B.Sc. P.Eng.
Secret Lab Technologies Ltd.
grant.likely at secretlab.ca
(403) 399-0195
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-03-07 16:26 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-03-07 7:02 [RFC PATCH] icecube/lite5200b: fix OF_TBCLK (timebase-frequency) calculation Domen Puncer
2007-03-07 7:02 ` [U-Boot-Users] " Domen Puncer
2007-03-07 16:25 ` Grant Likely
2007-03-07 16:25 ` [U-Boot-Users] " Grant Likely
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