[Buildroot] Problem generating rootfs for ci20 defconfig

[Paulo Matos <pmatos@igalia.com>]

While trying to generate an image using the ci20_defconfig (on
git 84d471a0b1) with a few
extra libraries added I am getting the following error:

>>>   Executing post-image script support/scripts/genimage.sh
INFO: cmd: "mkdir -p "/home/pmatos/roots/br-root.jsc32-mips/build/genimage.tmp"" (stderr):
INFO: cmd: "rm -rf "/home/pmatos/roots/br-root.jsc32-mips/build/genimage.tmp"/*" (stderr):
INFO: cmd: "mkdir -p "/home/pmatos/roots/br-root.jsc32-mips/build/genimage.tmp"" (stderr):
INFO: cmd: "cp -a "/tmp/tmp.ymKkcnSKic" "/home/pmatos/roots/br-root.jsc32-mips/build/genimage.tmp/root"" (stderr):
INFO: cmd: "find '/home/pmatos/roots/br-root.jsc32-mips/build/genimage.tmp/root' -depth -type d -printf '%P\0' | xargs -0 -I {} touch -r '/tmp/tmp.ymKkcnSKic/{}' '/home/pmatos/roots/br-root.jsc32-mips/build/genimage.tmp/root/{}'" (stderr):
ERROR: hdimage(sdcard.img): part rootfs size (62914560) too small for rootfs.ext4 (134217728)
make[1]: *** [Makefile:808: target-post-image] Error 1

Does anybody understand what this part rootfs size refers to? The
rootfs.ext4 size if the 128M I set as BR2_TARGET_ROOTFS_EXT2_SIZE but
unsure what the other number is, or what it means.

Kind regards,

Paulo Matos