| Message ID | 1453994509-13318-1-git-send-email-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Simon Horman |
| Headers | show |
Hello. On 01/28/2016 06:21 PM, Geert Uytterhoeven wrote: > When using a JTAG debugger on an sh73a0-based system, the debugger > looses connection with the hardware during kernel boot-up, as unused s/looses/loses/. > PM Domains are powered down by the genpd core. > > To keep on debugging, add a minimal device node for the Coresight-ETM > hardware block, and hook it up to the D4 PM Domain, so the R-Mobile > System Controller driver will keep the domain powered. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > --- > Not intended for upstream merge, as the D4 PM Domain is not needed for > normal use. > --- > arch/arm/boot/dts/sh73a0.dtsi | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/arm/boot/dts/sh73a0.dtsi b/arch/arm/boot/dts/sh73a0.dtsi > index 866ee5de09454d14..a6e47611cc807547 100644 > --- a/arch/arm/boot/dts/sh73a0.dtsi > +++ b/arch/arm/boot/dts/sh73a0.dtsi > @@ -40,6 +40,11 @@ > }; > }; > > + ptm { What's 'ptm'? > + compatible = "arm,coresight-etm3x"; > + power-domains = <&pd_d4>; > + }; > + > timer@f0000600 { > compatible = "arm,cortex-a9-twd-timer"; > reg = <0xf0000600 0x20>; MBR, Sergei
On Thu, Jan 28, 2016 at 4:42 PM, Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> wrote: > On 01/28/2016 06:21 PM, Geert Uytterhoeven wrote: > >> When using a JTAG debugger on an sh73a0-based system, the debugger >> looses connection with the hardware during kernel boot-up, as unused > > s/looses/loses/. $ dict loose [...] From The Collaborative International Dictionary of English v.0.48 [gcide]: Loose \Loose\ (l[=oo]s), v. n. [imp. & p. p. {Loosed} (l[=oo]st); p. pr. & vb. n. {Loosing}.] [From {Loose}, a.] 1. To untie or unbind; to free from any fastening; to remove the shackles or fastenings of; to set free; to relieve. [1913 Webster] Yeah, there are two verbs, to loose and to lose... >> --- a/arch/arm/boot/dts/sh73a0.dtsi >> +++ b/arch/arm/boot/dts/sh73a0.dtsi >> @@ -40,6 +40,11 @@ >> }; >> }; >> >> + ptm { > > What's 'ptm'? Program Trace Macrocell (first hit of http://lmgtfy.com/?q=arm+ptm ;-) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
Hello. On 01/28/2016 08:10 PM, Geert Uytterhoeven wrote: >>> When using a JTAG debugger on an sh73a0-based system, the debugger >>> looses connection with the hardware during kernel boot-up, as unused >> >> s/looses/loses/. > > $ dict loose > > [...] > > From The Collaborative International Dictionary of English v.0.48 [gcide]: > > Loose \Loose\ (l[=oo]s), v. n. [imp. & p. p. {Loosed} > (l[=oo]st); p. pr. & vb. n. {Loosing}.] [From {Loose}, a.] > 1. To untie or unbind; to free from any fastening; to remove > the shackles or fastenings of; to set free; to relieve. > [1913 Webster] > > Yeah, there are two verbs, to loose and to lose... I know, and I was sure you used the wrong one. It's a frequent typo. >>> --- a/arch/arm/boot/dts/sh73a0.dtsi >>> +++ b/arch/arm/boot/dts/sh73a0.dtsi >>> @@ -40,6 +40,11 @@ >>> }; >>> }; >>> >>> + ptm { >> What's 'ptm'? > Program Trace Macrocell > (first hit of http://lmgtfy.com/?q=arm+ptm ;-) Thank you for explaining. > Gr{oetje,eeting}s, > > Geert MBR, Sergei
diff --git a/arch/arm/boot/dts/sh73a0.dtsi b/arch/arm/boot/dts/sh73a0.dtsi index 866ee5de09454d14..a6e47611cc807547 100644 --- a/arch/arm/boot/dts/sh73a0.dtsi +++ b/arch/arm/boot/dts/sh73a0.dtsi @@ -40,6 +40,11 @@ }; }; + ptm { + compatible = "arm,coresight-etm3x"; + power-domains = <&pd_d4>; + }; + timer@f0000600 { compatible = "arm,cortex-a9-twd-timer"; reg = <0xf0000600 0x20>;
When using a JTAG debugger on an sh73a0-based system, the debugger looses connection with the hardware during kernel boot-up, as unused PM Domains are powered down by the genpd core. To keep on debugging, add a minimal device node for the Coresight-ETM hardware block, and hook it up to the D4 PM Domain, so the R-Mobile System Controller driver will keep the domain powered. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- Not intended for upstream merge, as the D4 PM Domain is not needed for normal use. --- arch/arm/boot/dts/sh73a0.dtsi | 5 +++++ 1 file changed, 5 insertions(+)