Sanjeev, With GPIO hwmod series, OMAP3EVM board is not up with DHCP + nfs root. This issue was reported by Kevin.
The root cause of this issue is that during OMAP3EVM board init, the Ethernet controller (smsc911x) is not reset and it relies on the uboot configurations for it's operations. The reset GPIO pin used for this purpose is not even reserved. After gpio hmwod series are merged, this patch is required to make the EVM board working. Also omap3evm_init_smsc911x() needs to be fixed including CS settings and other required settings for Ethernet controller. Links to related discussions: http://www.spinics.net/lists/linux-omap/msg37234.html http://www.spinics.net/lists/linux-omap/msg36698.html http://www.spinics.net/lists/linux-omap/msg36799.html The below patch is tested on OMAP3 EVM board (ES3.1). Thanks, V Charulatha > -----Original Message----- > From: Varadarajan, Charulatha > Sent: Saturday, September 25, 2010 5:07 PM > To: linux-omap@vger.kernel.org > Cc: khil...@deeprootsystems.com; t...@atomide.com; Premi, Sanjeev; > Varadarajan, Charulatha > Subject: [PATCH RFC:] FIX: OMAP3EVM: Ethernet controller smsc911x reset > > Do reset of Ethernet controller smsc911x using OMAP gpio7 > while initializing the Ethernet controller. > > Signed-off-by: Charulatha V <ch...@ti.com> > --- > arch/arm/mach-omap2/board-omap3evm.c | 16 ++++++++++++++++ > 1 files changed, 16 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach- > omap2/board-omap3evm.c > index f76d9c0..54a7e20 100644 > --- a/arch/arm/mach-omap2/board-omap3evm.c > +++ b/arch/arm/mach-omap2/board-omap3evm.c > @@ -55,6 +55,7 @@ > #define OMAP3EVM_ETHR_SIZE 1024 > #define OMAP3EVM_ETHR_ID_REV 0x50 > #define OMAP3EVM_ETHR_GPIO_IRQ 176 > +#define OMAP3EVM_ETHR_GPIO_RST 7 > #define OMAP3EVM_SMSC911X_CS 5 > > static u8 omap3_evm_version; > @@ -134,6 +135,20 @@ static inline void __init > omap3evm_init_smsc911x(void) > else > rate = clk_get_rate(l3ck); > > + /* Configure ethernet controller reset gpio */ > + if (gpio_request(OMAP3EVM_ETHR_GPIO_RST, "SMSC911x gpio") < 0) { > + pr_err(KERN_ERR "Failed to request GPIO8 for smsc911x > gpio\n"); > + return; > + } > + > + gpio_direction_output(OMAP3EVM_ETHR_GPIO_RST, 1); > + > + /* reset pulse to ethernet controller*/ > + gpio_set_value(OMAP3EVM_ETHR_GPIO_RST, 0); > + usleep_range(150, 220); > + gpio_set_value(OMAP3EVM_ETHR_GPIO_RST, 1); > + usleep_range(1, 2); > + > if (gpio_request(OMAP3EVM_ETHR_GPIO_IRQ, "SMSC911x irq") < 0) { > printk(KERN_ERR "Failed to request GPIO%d for smsc911x IRQ\n", > OMAP3EVM_ETHR_GPIO_IRQ); > -- > 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
