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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Sun, 10 Dec 2017 23:08:06 +0000
Message-ID: <CAKv+Gu8_Gu276s2_Ufh_TjR19jtEQhuuj=wHJDr0Fmy4WXi+Zw@mail.gmail.com>
To: Michael Zimmermann <sigmaepsilon92@gmail.com>
Cc: "Gao, Liming" <liming.gao@intel.com>, Yonghong Zhu <yonghong.zhu@intel.com>,
 edk2-devel-01 <edk2-devel@lists.01.org>,
 Leif Lindholm <leif.lindholm@linaro.org>
Subject: Re: PrePiLib's FwVol.c can't handle padding before volume header
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On 10 December 2017 at 22:18, Michael Zimmermann
<sigmaepsilon92@gmail.com> wrote:
> Exactly. If I shift the pointer by 4 bytes from within PrePiLib the device
> boots just fine.
>
> I'm not sure if the size is the root cause but right now it only happens
> when adding a ~15mb binary efi to the end of fvmain.
>

It appears so.

So it would be good to check where the disparity originates.

The Ffs section containing the compressed FV looks like this for ArmVirtQemu

$ hexdump -C 9E21FD93-9C72-4c15-8C4B-E77F1DB2D792SEC1.1fv.sec |head

00000000  84 a8 48 17 00 00 00 00  00 00 00 00 00 00 00 00  |..H.............|
00000010  00 00 00 00 78 e5 8c 8c  3d 8a 1c 4f 99 35 89 61  |....x...=..O.5.a|
00000020  85 c3 2d d3 80 a8 48 00  00 00 00 00 5f 46 56 48  |..-...H....._FVH|
00000030  ff fe 04 00 48 00 24 2b  00 00 00 02 a2 22 01 00  |....H.$+....."..|
00000040  40 00 00 00 00 00 00 00  00 00 00 00 7f cb a2 d6  |@...............|
00000050  18 6a 2f 4e b4 3b 99 20  a7 33 70 0a 4d aa 05 00  |.j/N.;. .3p.M...|
00000060  30 c0 01 f8 04 c0 01 10  4d 5a 00 00 00 00 00 00  |0.......MZ......|
00000070  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
000000a0  00 00 00 00 58 0e 00 00  00 00 00 00 00 00 00 00  |....X...........|

Could you compare with your build?