Dear Konstantinos Margaritis, > (Disclaimer: u-boot newbie) > > Hi all, > > With Marek's huge help (thanks Marek!) I've tried to merge his tree [1] > that provides lcd support for the efikamx/efikasb with recent mainline > uboot. It boots, but I've hit some wall now and couldn't get passed it, > so I thought I'd ask for some expert advice, Marek suggested I mail > here and CC himself and Stefano as well. > > So, I've migrated the structures to the iomux v3 coding conventions, > added some missing defines for iomuxes used, etc. I've forked the code > in github [2] and am doing all the changes there, in the hope that I can > at some point submit it back to mainline. I also want to to enable > multi-host USB support for the platform so that tftp booting will be at > last possible, but that's going to happen later, I want to be done with > LCD first. > > The result boots, but in short it fails to initialise the LCD (for the > efikamx, didn't test efikasb yet). I noticed that amongst many changes, > in drivers/i2c/mxc_i2c.c, i2c_imx_bus_busy() in Marek's tree () got > sort of replaced with wait_for_sr_state(), which does the same > thing but is more generic -or so I understand, please correct me if I'm > wrong in my interpretation. > > So what's the problem? Well, I2CR_MSTA (master mode) is set, but > I2SR_IBB fails to get set. In every case I get this result in the > I2SR register: > > I2SR = 81 -> I2SR_ICF | I2SR_RX_NO_AK, ie. > > which according to the iMX515 Reference Manual corresponds to: > > "Transfer is complete, and set by the falling edge of the ninth clock > of a byte transfer." + "A “No acknowledge” signal was detected > at the ninth clock." > > so a previous answer didn't send an acknowledge or rather the > opposite it sent a NACK. > > I'm at a loss here, attaching a boot log where I added some printfs > around. I'd appreciate any pointer as to what I'm doing wrong.
Honestly, I have a feeling the MX51 I2C controller might be broken. Isn't there maybe something in the ERRATA for MX51 (I know it's HUGE) ? Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
