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[PATCH] powerpc: Add back support for booting from BootX (#2)

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ARCH=powerpc couldn't boot from BootX as it uses a "different" way of
getting in the kernel. This patch adds the necessary trampolines,
creating a flattened device-tree from the tree passed from MacOS, and
initializing the btext engine early for really-early debugging.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2005-11-23 17:58:13 +11:00
committed by Paul Mackerras
parent 51d3082fe6
commit d7f3945420
4 changed files with 729 additions and 0 deletions
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13
arch/powerpc/kernel/head_32.S
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@@ -125,6 +125,19 @@ __start:
bl prom_init
trap
/*
* Check for BootX signature when supporting PowerMac and branch to
* appropriate trampoline if it's present
*/
#ifdef CONFIG_PPC_PMAC
1: lis r31,0x426f
ori r31,r31,0x6f58
cmpw 0,r3,r31
bne 1f
bl bootx_init
trap
#endif /* CONFIG_PPC_PMAC */
1: mr r31,r3 /* save parameters */
mr r30,r4
li r24,0 /* cpu # */