linux-kernel - RE: [PATCH 1/1] davinci: changed SRAM allocator to shared ram.

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Date:	Thu, 24 Feb 2011 16:57:54 +0530
From:	"Nori, Sekhar" <nsekhar@...com>
To:	Subhasish Ghosh <subhasish@...tralsolutions.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Watkins, Melissa" <m-watkins@...com>,
	"sachi@...tralsolutions.com" <sachi@...tralsolutions.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Russell King <linux@....linux.org.uk>,
	Michael Williamson <michael.williamson@...ticallink.com>,
	"Chemparathy, Cyril" <cyril@...com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] davinci: changed SRAM allocator to shared ram.

Hi Subhasish,

On Thu, Feb 24, 2011 at 15:54:56, Subhasish Ghosh wrote:
> --------------------------------------------------
> From: "Nori, Sekhar" <nsekhar@...com>
> Sent: Wednesday, February 23, 2011 9:00 PM
> To: "Subhasish Ghosh" <subhasish@...tralsolutions.com>; 
> <davinci-linux-open-source@...ux.davincidsp.com>
> Cc: <linux-arm-kernel@...ts.infradead.org>; "Watkins, Melissa" 
> <m-watkins@...com>; <sachi@...tralsolutions.com>; "Kevin Hilman" 
> <khilman@...prootsystems.com>; "Russell King" <linux@....linux.org.uk>; 
> "Michael Williamson" <michael.williamson@...ticallink.com>; "Chemparathy, 
> Cyril" <cyril@...com>; "Sergei Shtylyov" <sshtylyov@...mvista.com>; "open 
> list" <linux-kernel@...r.kernel.org>
> Subject: RE: [PATCH 1/1] davinci: changed SRAM allocator to shared ram.
> 
> > Hi Subhasish,
> >
> > On Fri, Feb 11, 2011 at 19:51:28, Subhasish Ghosh wrote:
> >> This patch modifies the sram allocator to allocate memory
> >> from the DA8XX shared RAM.
> >
> > It will be nice to know if you tried suspend-to-RAM
> > after this change and found it to be working.
> >
> 
> SG -- My file system is currently mounted from MMC.
>           Suspend to RAM seems to have bug with MMC.
>            (http://processors.wiki.ti.com/index.php/OMAP-L1_Linux_Drivers_Usage#Suspend-to-RAM)

You can try Kevin's suggestion here:

http://linux.davincidsp.com/pipermail/davinci-linux-open-source/2011-January/021807.html

>           I had tried NFS earlier, but I think there is some problem with 
> NFS boot and udev with this kernel.

Anyway there are some problems reported with Ethernet
driver and suspend on the latest kernel. Folks inside
TI are working on it.

>            So, currently I will not be able to do it, but will try if I get 
> a chance.

How about using ramdisk?

Thanks,
Sekhar

> > Thanks,
> > Sekhar
> >
> >>
> >> Signed-off-by: Subhasish Ghosh <subhasish@...tralsolutions.com>
> >> ---
> >>  arch/arm/mach-davinci/da850.c              |    6 +++---
> >>  arch/arm/mach-davinci/include/mach/da8xx.h |    1 +
> >>  2 files changed, 4 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/arch/arm/mach-davinci/da850.c 
> >> b/arch/arm/mach-davinci/da850.c
> >> index 3443d97..8a4de97 100644
> >> --- a/arch/arm/mach-davinci/da850.c
> >> +++ b/arch/arm/mach-davinci/da850.c
> >> @@ -711,7 +711,7 @@ static struct map_desc da850_io_desc[] = {
> >>  },
> >>  {
> >>  .virtual = SRAM_VIRT,
> >> - .pfn = __phys_to_pfn(DA8XX_ARM_RAM_BASE),
> >> + .pfn = __phys_to_pfn(DA8XX_SHARED_RAM_BASE),
> >>  .length = SZ_8K,
> >>  .type = MT_DEVICE
> >>  },
> >> @@ -1083,8 +1083,8 @@ static struct davinci_soc_info 
> >> davinci_soc_info_da850 = {
> >>  .gpio_irq = IRQ_DA8XX_GPIO0,
> >>  .serial_dev = &da8xx_serial_device,
> >>  .emac_pdata = &da8xx_emac_pdata,
> >> - .sram_dma = DA8XX_ARM_RAM_BASE,
> >> - .sram_len = SZ_8K,
> >> + .sram_dma = DA8XX_SHARED_RAM_BASE,
> >> + .sram_len = SZ_128K,
> >>  .reset_device = &da8xx_wdt_device,
> >>  };
> >>
> >> diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h 
> >> b/arch/arm/mach-davinci/include/mach/da8xx.h
> >> index cfcb223..c3c3339 100644
> >> --- a/arch/arm/mach-davinci/include/mach/da8xx.h
> >> +++ b/arch/arm/mach-davinci/include/mach/da8xx.h
> >> @@ -70,6 +70,7 @@ extern unsigned int da850_max_speed;
> >>  #define DA8XX_AEMIF_CTL_BASE 0x68000000
> >>  #define DA8XX_DDR2_CTL_BASE 0xb0000000
> >>  #define DA8XX_ARM_RAM_BASE 0xffff0000
> >> +#define DA8XX_SHARED_RAM_BASE 0x80000000
> >>
> >>  void __init da830_init(void);
> >>  void __init da850_init(void);
> >> -- 
> >> 1.7.2.3
> >>
> >>
> > 
> 

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