I'm currently working on U-Boot support for the Freescale i.mx28evk board.
This is already supported mainline.
Hm; my workspace is quite up-to-date, but I didn't find it. What configuration should I use for the Freescale i.mx28evk board? m28evk_config boots the board, but not much more. The difference between the Freescale i.mx28evk board and the Denx m28evk modules are too big (eg. ssp2 for mmc1, etc.)
The DENX board is actually ok, working properly,
I don't doubt the working of the Denx module; I'm sure it works fine, but I don't have one laying around, so I cannot check. However, the configuration for the Denx m28evk module doesn't work very well on the Freescale i.mx28evk board.
you don't understand what's going on in there.
No need to be harsh; I don't have a diagram of the Denx board, so I don't know what clock configuration was chosen for it's design.
The RMII mode of PHY supplies clock to CPU. Read the manual before you start doing some wild acusations please :-)
On my board, there wasn't any clock signal between the SoC and the PHYs, regardless of who's supposed to source it. I can lift R171 and check who's supplying it after my modification, but I'm pretty sure it's the SoC. This situation works, but may still be wrong; No argument there. But this is the same situation as the old Freescale supplied u-boot 2009.08 does it.
I don't see how the LAN8720 PHY can supply a clock to the SoC. XTAL1 is an output only and XTAL2 is only intended to drive a chrystal, and not connected anyway. Are we talking about the same board?
The Ethernet clock is configured properly by cpu_eth_init in ./arch/arm/cpu/arm926ejs/mx28/mx28.c. But later in the boot process, board_eth_init in board/denx/m28evk/m28evk.c tries to configure the Ethernet clock again. Unfortunately that second configuration is just disabling the clock: clrsetbits_le32(&clkctrl_regs->hw_clkctrl_enet, CLKCTRL_ENET_TIME_SEL_MASK | CLKCTRL_ENET_CLK_OUT_EN, CLKCTRL_ENET_TIME_SEL_RMII_CLK); After removing this line, I measured a 25MHz clock, communication with the PHYs worked and I successfully tftp'ed a kernel from my server.
It's different -- M28EVK and MX28EVK are.
Yes, I know. I'm working with the MX28EVK, not the M28EVK.
Does you board have an external clock oscillator for the PHYs?
Yes.
Aha, so we are talking about different boards.
If not, do you agree with removing this line?
No.
I'm sorry; I asked the wrong question. What I should have asked was: Do you agree with not copying this line to the MX28EVK configuration?