[yocto] couple simple questions on building for intel galileo

[Robert P. J. Day]

On Thu, 8 May 2014, Diego Sueiro wrote:

> Robert,
> Here is some instructions with some workarounds:
> http://www.malinov.com/Home/sergey-s-blog/intelgalileo-buildinglinuximage
>
> And I think that you already saw meta-intel-iot-devkit:
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-intel-iot-devkit/
>
> As soon as I get my Galileo I'll try to put Yocto on it.
>
> Please, share your results with us.

  oh, i'm currently writing all this up and, at the risk of going
*slightly* off-topic, before i set up for a yocto build for this
board, i'm just trying to clarify the boot process, both without and
with the SD card, so i know i'm bulding my SD card properly.

  first, without an SD card, the board apparently boots a minimal
linux image from SPI flash. so far, so good.

  as for creating a bootable SD card, i see two possibilities. the
first is explained at sparkfun:

https://learn.sparkfun.com/tutorials/galileo-getting-started-guide/bigger-linux-image

where one can download a file called
LINUX_IMAGE_FOR_SD_Intel_Galileo_v0.7.5.7z, which uncompresses into a
simple directory structure that you copy to a FAT-formatted SD card.
so this SD card, apparently, contains a single FAT partition.

  on the other hand, over at intel's developer zone:

https://software.intel.com/en-us/iotdevkit

one can download what is described as "SD card (200MB zipped)", which
i unzipped into a file "iot-devkit-201402201605-mmcblkp0.direct",
almost 8G in size, and which "fdisk" shows me has the following
structure:

Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0007eabb

Device                                   Boot     Start       End
Blocks  Id System
iot-devkit-201402201605-mmcblkp0.direct1 *         2048    106493   52223  83 Linux
iot-devkit-201402201605-mmcblkp0.direct2         106496  14442495 7168000  83 Linux

  which is more what i'm used to. so am i reading both of these
correctly? there are two possible formats for the bootable SD card:

* simple, single FAT partition, or
* more "standard" pair of bootable FAT partition, and linux ext
partition.

  many thanks.

rday


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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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