W dniu sobota, 22 marca 2014 01:19:58 UTC+1 użytkownik Joshua Datko napisał:
>
> I am trying to enable the i2c-2 bus in mainline uBoot and having problems.
> I am building a cape that has a Trusted Platform Module (TPM) on pins
> P9_19/20, i2c-2. Using some creative wiring, when I connect the cape to
> i2c-1, everything works fine.
>
> I added this in /board/ti/am225x/mux.c:
>
> static struct module_pin_mux i2c2_pin_mux[] = {
> {OFFSET(uart1_ctsn), (MODE(3) | RXACTIVE |
> PULLUDEN | SLEWCTRL)}, /* I2C_DATA */
> {OFFSET(uart1_rtsn), (MODE(3) | RXACTIVE |
> PULLUDEN | SLEWCTRL)}, /* I2C_SCLK */
> {-1},
> };
>
> In enable_board_pin_mux, I put the following before any of the ifs:
>
> configure_module_pin_mux(i2c2_pin_mux);
>
> and added a puts after to ensure it was getting hit.
>
> When I break in uboot and try to switch to i2c-2, the BBB resets as
> follows:
>
> U-Boot# i2c dev 2
> Setting bus to 2
> data abort
> pc : [<9f7745c4>] lr : [<9f7745bc>]
> sp : 9f637dc0 ip : 00000000 fp : 9f638598
> r10: 9f7a7680 r9 : 9f637f28 r8 : 000186a0
> r7 : 00000001 r6 : 9f7a47d4 r5 : 000186a0 r4 : 00000001
> r3 : 0000002c r2 : 00000001 r1 : 00000002 r0 : 4819c000
> Flags: nZCv IRQs off FIQs on Mode SVC_32
> Resetting CPU ...
>
> I'm not quite sure where to go from here. It appears, to me, that uBoot
> has an issue with i2c-2 and any help would be appreciated. I *could*
> switch the TPM over to i2c-1 but I'd rather not change the hardware unless
> using i2c-2 is impossible for some reason in uBoot.
>
You should also enable clock for i2c-2 bus. I have done this by adding:
writel(PRCM_MOD_EN, &cmper->i2c2clkctrl);
while (readl(&cmper->i2c2clkctrl) != PRCM_MOD_EN) ;
And I have used spi0_sclk and spi0_d0 for my i2c2 bus.
But on my beaglebone black based board I keep getting:
timed out in wait_for_pin: I2C_STAT=0
error all the time for i2c probe command. The same bootloader works
correctly with original BBB,
The only difference on my board is missing EEPROM.
> Josh
>
Robert Kmiec
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