Through Fedora 18 GA we've had a one-to-one mapping between the SoC and
the kernel rpm. Likewise, we produced a different filesystem image for
each SoC (EG, a highbank image, a panda image, a trimslice image, etc).
Since then the unified kernel in 3.7 and beyond has introduced the
ability to use a single kernel for multiple SoCs. This introduces the
pleasant prospect of having a single filesystem image that boots on
multiple ARM platforms. In fact, the standard unified kernel for F19
(3.9) may support highbank, omap, and versatile express all from the
same vmlinuz. Doing this still requires loading the right dbt, but I
have a plan for that. Doing this also requires creating a uImage with
the right load address, IE:
mkimage -A arm -O linux -T kernel -C none -a $ubootAddress
The trouble is, there is no unified $ubootAddress available. The
pandaboard uses 0x80008000, highbank and tegra use 0x00008000, a10 and
exynos5 use 0x40008000, and so forth. Not sure about beaglebone. If we
want to realize the dream of having a unified F19 release we need a
solution to this problem. I see three options:
1. Use the 0x00008000 address for highbank/tegra, demand bootz support
for everybody else. Since we control the panda/beagle/beaglebone uboots
they would be covered. Not clear on what this means for exynos5, but
exynos5 will use an LPAE kernel so that's a separate uimage already.
2. Generate multiple uImage files from a single kernel, then load the
appropriate uImage on boot.
3. Split up images to cope.
All 3 are viable, none are desirable. Is there a 4th option? If not,
what do want to go with?
--
Brendan Conoboy / Red Hat, Inc. / blc@xxxxxxxxxx
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