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Commit 7a2eacb7 authored by Stuart Menefy's avatar Stuart Menefy Committed by Paul Mundt
Browse files

sh: Provide a 29/32-bit physical hint for bootloaders. 



Shoves a magic word in to the empty_zero_page section for the
bootloader to work out whether to start the kernel in 29-bit
or 32-bit mode.

[ Renesas CPUs already take care of the initial PMB mappings entirely
  in hardware and decide on 29-bit/32-bit physical depending on which
  pin powered up the CPU, so this is mostly for ST parts. -- PFM ].

Signed-off-by: default avatarStuart Menefy <stuart.menefy@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 80a68a43

arch/sh/kernel/head_32.S

+5 −1
Original line number Diff line number Diff line
@@ -32,7 +32,11 @@ ENTRY(empty_zero_page) 
	.long	1		/* LOADER_TYPE */

	.long	0x00360000	/* INITRD_START */

	.long	0x000a0000	/* INITRD_SIZE */

	.long	0

#ifdef CONFIG_32BIT

	.long	0x53453f00 + 32	/* "SE?" = 32 bit */

#else

	.long	0x53453f00 + 29	/* "SE?" = 29 bit */

#endif

1:

	.skip	PAGE_SIZE - empty_zero_page - 1b