[U-Boot] i2c_set_bus_num freeze

Adam Ford aford173 at gmail.com
Fri Jan 27 00:20:21 CET 2017

On Jan 26, 2017 11:44 AM, "Ran Shalit" <ranshalit at gmail.com> wrote:


I have some issue in u-boot trying to access bus #1.

I can access bus #0, #2 with i2c dev 0/2

I can also access bus #0,1,2 from linux.

But on trying to access i2c #1 in u-boot in hangs:

The function i2c_set_bus_num get stuck .

ret = i2c_set_bus_num(1);

<<------- never gets here .........
 if (ret)
     printf("Failure changing bus number (%d)\n", ret);

It hangs in i2c_set_bus_num->i2c_init->


    printf("i2c_init 8\n");

bus_initialized[current_bus] = 1;
if (readw (I2C_CON) & I2C_CON_EN) {
writew (0, I2C_CON);
udelay (50000);

writew(psc, I2C_PSC);
writew(scll, I2C_SCLL);
writew(sclh, I2C_SCLH);

/* own address */
writew (slaveadd, I2C_OA);
writew (I2C_CON_EN, I2C_CON);

    printf("i2c_init 9\n");  <<------ never get printed ..................

I have seen a similar question, yet I am doing this access after u-boot
complete, and command prompt.

Is anyone familiar with this ?

What platform are you using?


U-Boot mailing list
U-Boot at lists.denx.de

More information about the U-Boot mailing list