At old overo boards TWL4030 RTC irq is connected to gpio112. Unfortunately this pin is also used for revision detection. Therefore we need to send shut-up to TWL4030 to avoid reading wrong revision. In SPL this must be done before SDRAM is set up because the type of SDRAM is revision dependent. By this patch it is ensured that all variables used by omap24xx_i2c.c are located in SRAM.
Signed-off-by: Andreas Müller schnitzeltony@gmx.de --- drivers/i2c/omap24xx_i2c.c | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/omap24xx_i2c.c b/drivers/i2c/omap24xx_i2c.c index 271ed60..44290b4 100644 --- a/drivers/i2c/omap24xx_i2c.c +++ b/drivers/i2c/omap24xx_i2c.c @@ -35,10 +35,15 @@ static void wait_for_bb(void); static u16 wait_for_pin(void); static void flush_fifo(void);
-static struct i2c *i2c_base = (struct i2c *)I2C_DEFAULT_BASE; - -static unsigned int bus_initialized[I2C_BUS_MAX]; -static unsigned int current_bus; +/* + * For SPL boot some boards need i2c before SDRAM is initialised so force + * variables to live in SRAM + */ +static struct i2c __attribute__ ((section (".data"))) *i2c_base = + (struct i2c *)I2C_DEFAULT_BASE; +static unsigned int __attribute__ ((section (".data"))) bus_initialized[I2C_BUS_MAX] = + { [0 ... (I2C_BUS_MAX-1)] = 0 }; +static unsigned int __attribute__ ((section (".data"))) current_bus = 0;
void i2c_init(int speed, int slaveadd) {