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author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2018-12-07 00:13:22 -0800 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-12-10 10:04:39 +0100 |
commit | 392ae40c2c10e0bf657723bc3fdd8a9a7fa54b77 (patch) | |
tree | 954c83d77d8c1edd7e2875c0e1bbac9e2ad3e405 /Documentation | |
parent | 32c01aa6c8a6310d09b706fd634f439cc3d115e3 (diff) | |
download | barebox-392ae40c2c10e0bf657723bc3fdd8a9a7fa54b77.tar.gz barebox-392ae40c2c10e0bf657723bc3fdd8a9a7fa54b77.tar.xz |
Documentation: i.MX: Document how to use GPT
Document a way to avoid clashes between i.MX boot info/Barebox and
GPT's Partition Entry Array.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/boards/imx.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/boards/imx.rst b/Documentation/boards/imx.rst index 99ca10b7cc..35a180b0dd 100644 --- a/Documentation/boards/imx.rst +++ b/Documentation/boards/imx.rst @@ -60,6 +60,25 @@ The images can also always be started second stage:: bootm /mnt/tftp/barebox-freescale-imx51-babbage.img +Using GPT on i.MX +^^^^^^^^^^^^^^^^^ + +For i.MX SoCs that place vendor specific header at +1KiB mark of a +boot medium, special care needs to be taken when parition that medium +with GPT. In order to make room for i.MX boot header GPT Partition +Entry Array needs to be moved from its typical location, LBA 2, to an +offset past vendor specific information. One way to do this would be +to use ``-j`` or ``--adjust-main-table`` option of ``sgdisk``. For +example, the following sequence: + + sgdisk -Z <block device> + sgdisk -o -j 2048 -n 1:8192:+100M <block device> + +will create a single GPT partition starting at LBA 8192 and would +place Partition Entry Array starting at LBA 2048 which should leave +enough room for Barebox/i.MX boot header. Once that is done ``dd`` +command above can be used to place Barebox on the same medium. + Information about the ``imx-image`` tool ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |