[U-Boot] commit 83e359adf9f578a58f20daf2e4425a754defac7b breaks mmc

[Felipe Balbi]

Hi,

On Tue, Sep 09, 2014 at 12:09:02PM -0500, Felipe Balbi wrote:
> Hi,
> 
> commit 83e359a (am335x_evm: Enable CONFIG_SPL_ENV_SUPPORT on EMMC_BOOT)
> breaks MMC on some boards. I believe it only breaks if EMMC has no
> partition on it, so that would point out to a bug on spl env support
> itself and this has only exposed it.
> 
> Here's a bisection log anyway:
> 
> git bisect start
> # good: [524123a70761110c5cf3ccc5f52f6d4da071b959] Prepare v2014.07
> git bisect good 524123a70761110c5cf3ccc5f52f6d4da071b959
> # bad: [0b703dbcee7103f07804d0a4328d1593355c4324] patman: Fix detection of git version
> git bisect bad 0b703dbcee7103f07804d0a4328d1593355c4324
> # good: [63b85adcecdd019f049cbbebf10119cea45d3645] imx: ventana: set dynamic env var for flash layout
> git bisect good 63b85adcecdd019f049cbbebf10119cea45d3645
> # good: [63b85adcecdd019f049cbbebf10119cea45d3645] imx: ventana: set dynamic env var for flash layout
> git bisect good 63b85adcecdd019f049cbbebf10119cea45d3645
> # good: [04b43f32731c1171877541050bb3f2bfeb100e3d] tools/genboardscfg.py: ignore defconfigs starting with a dot
> git bisect good 04b43f32731c1171877541050bb3f2bfeb100e3d
> # bad: [6defdc0b5552ab1af4a66a8abac8196cbb6b9e15] Merge branch 'master' of git://git.denx.de/u-boot-ti
> git bisect bad 6defdc0b5552ab1af4a66a8abac8196cbb6b9e15
> # good: [6af857c50df4e62ec08e51ad73c96f63f1480386] Merge branch 'master' of http://git.denx.de/u-boot-sunxi
> git bisect good 6af857c50df4e62ec08e51ad73c96f63f1480386
> # good: [7f14fb20f895016fb38d30ce71aeb4d441b5bcb8] Merge branch 'zynq' of git://www.denx.de/git/u-boot-microblaze
> git bisect good 7f14fb20f895016fb38d30ce71aeb4d441b5bcb8
> # bad: [61f66fd5a81b97478e9d14326c1059baa6626680] keystone2: use EFUSE_BOOTROM information to configure PLLs
> git bisect bad 61f66fd5a81b97478e9d14326c1059baa6626680
> # bad: [fea9543f1bd1d068a372ef378f624941c25989a8] board/ti/am335x: update configs for parallel NAND
> git bisect bad fea9543f1bd1d068a372ef378f624941c25989a8
> # good: [e017fd61c5a89e32db682d94d8d669df1709edbb] tseries: Set CONFIG_ENV_IS_NOWHERE for SPL+NAND
> git bisect good e017fd61c5a89e32db682d94d8d669df1709edbb
> # bad: [83e359adf9f578a58f20daf2e4425a754defac7b] am335x_evm: Enable CONFIG_SPL_ENV_SUPPORT on EMMC_BOOT
> git bisect bad 83e359adf9f578a58f20daf2e4425a754defac7b
> # good: [00e385325fce36fa13d48091d73b1b3428394b6b] common/Makefile: Consolidate SPL ENV options, correct inclusion
> git bisect good 00e385325fce36fa13d48091d73b1b3428394b6b
> # first bad commit: [83e359adf9f578a58f20daf2e4425a754defac7b] am335x_evm: Enable CONFIG_SPL_ENV_SUPPORT on EMMC_BOOT
> 
> Revert that commit also makes it work, btw.
> 
> On a further dig into this, it looks like when enabling
> CONFIG_SPL_ENV_SUPPORT, somehow MMC numbering changes and u-boot ends up
> trying to read environment from a non-formatted EMMC.

forgot to mention, this is all on BBB and affects only am335x-based
boards, of course.

-- 
balbi
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