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powerpc: Check flat device tree version at boot

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In commit e6a6928c3e "of/fdt: Convert FDT functions to use libfdt",
the kernel stopped supporting old flat device tree formats. The minimum
supported version is now 0x10.

There was a checking function added, early_init_dt_verify(), but it's
not called on powerpc.

The result is, if you boot with an old flat device tree, the kernel will
fail to parse it correctly, think you have no memory etc. and hilarity
ensues.

We can't really fix it, but we can at least catch the fact that the
device tree is in an unsupported format and panic(). We can't call
BUG(), it's too early.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2014-08-28 18:40:47 +10:00
parent d6a4f70909
commit ad72a279a2
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/prom.c
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@ -642,6 +642,10 @@ void __init early_init_devtree(void *params)
DBG(" -> early_init_devtree(%p)\n", params);
/* Too early to BUG_ON(), do it by hand */
if (!early_init_dt_verify(params))
panic("BUG: Failed verifying flat device tree, bad version?");
/* Setup flat device-tree pointer */
initial_boot_params = params;