Messages in this thread | | | Subject | Re: BUG: A31s Not booting anymore | From | Philipp Rossak <> | Date | Tue, 13 Feb 2018 02:25:58 +0100 |
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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
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