Ok - so I think I found how to mount the drive - from edison:
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mkdir /upgrade
mount -o offset=8192 -t vfat /dev/mmcblk0p9 /upgrade
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from linux box:
cd /home/user/upgrade-directory-containing-unzipped-firmware-files
sftp root@192.168.11.145
cd /upgrade
put -r ./*
mkdir u-boot-envs
cd u-boot-envs
lcd u-boot-envs
put ./*
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from edison:
reboot ota
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result:
Success - Thank you all!