On 12.02.2018 19:21, Philipp Rossak wrote:

Hey,

When I try to boot my A31s (Bananapi M2) u-boot is showing only Starting 
kernel ... . After enabling the earlyprintk I could capture this log: [1].

After reverting those 5 commits from Chen-Yu I was able to boot again:


clk: sunxi-ng: Support fixed post-dividers on NM style clocks
7d333ef1cc1b8c8951f3a2c41f6406e2295d8be9

clk: sunxi-ng: sun8i: a83t: Add /2 fixed post divider to audio PLL
10e6eb4f2c5b35ae71c9bc0db83d74238719b453

clk: sunxi-ng: sun8i: a83t: Use sigma-delta modulation for audio PLL
e952ca3c6b2ffdfbf9618e4bd3e9aad1ff3f5eb4

clk: sunxi-ng: Support fixed post-dividers on MP style clocks
946797aa3f08e2f6f5992f3ec2be44791e9b9260

clk: sunxi-ng: sun50i: a64: Add 2x fixed post-divider to MMC module clocks
83fe3be4d1974f5f50c5e2039a1609f4960e8579


I allready tried to fix it with making them save against zero:

if (cmp->common.features & CCU_FEATURE_FIXED_POSTDIV && \
 ??????? cmp->fixed_post_div with)
 ?????????????? rate *= cmp->fixed_post_div;

But that didn't help.

Any ideas?

Regards,
Philipp

[1]: https://pastebin.com/64Fzzqvg

It took me some time, but I have now a few more infos:

Right now the code breaks at this point here [1], with this clock [2].
If we have a look now at the clock config [3], we see here a table which 
is an u8 array and also a fixed_predivs struct.

If we have a look at the function call where it breaks [4], shouldn't 
the table be a clk_div_table struct instead of an u8?

The a31s is the only board where we have this combination of a 
fixed_predivs and a table.

Philipp


Related Clock source register A31s:

0000: OSC24MHz/750=32KHz
0001: LOSC
0010: OSC24MHz
0011: /
0100: /
0101: /
0110: /
0111: /
1000: /
1001: /
1010: /
1011: AXICLK/4
1100: /
1101: AHB1CLK/4
1110: /
1111: /


[1]: 
http://lxr.bootlin.com/linux/v4.16-rc1/source/drivers/clk/clk-divider.c#L89

[2]: 
http://lxr.bootlin.com/linux/v4.16-rc1/source/drivers/clk/sunxi-ng/ccu-sun6i-a31.c#L1137

[3]: 
http://lxr.bootlin.com/linux/v4.16-rc1/source/drivers/clk/sunxi-ng/ccu-sun6i-a31.c#L749

[4]: 
http://lxr.bootlin.com/linux/v4.16-rc1/source/drivers/clk/clk-divider.c#L93