[PATCH 1/2] MIPS: BCM47XX: select BOOT_RAW

[PATCH 1/2] MIPS: BCM47XX: select BOOT_RAW

[Hauke Mehrtens]

All the boot loaders I have seen are booting the kernel in raw mode by
default. CFE seams to support elf kernel images too, but the default
case is raw for the devices I know of. Select this option to make the
kernel boot on most of the devices with the default options.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/mips/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index fa171a3..564a06f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -102,6 +102,7 @@ config ATH79
 config BCM47XX
 	bool "Broadcom BCM47XX based boards"
 	select ARCH_REQUIRE_GPIOLIB
+	select BOOT_RAW
 	select CEVT_R4K
 	select CSRC_R4K
 	select DMA_NONCOHERENT
-- 
1.7.9.5

[PATCH 2/2] MIPS BCM47XX: select NO_EXCEPT_FILL

[Hauke Mehrtens]

The kernel is loaded to 0x80001000 so there is some space left for the
exception handlers and the kernel do not have to reserve some extra
space for them.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 arch/mips/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 564a06f..e372fe3 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -108,6 +108,7 @@ config BCM47XX
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select IRQ_CPU
+	select NO_EXCEPT_FILL
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
 	select SYS_HAS_EARLY_PRINTK
-- 
1.7.9.5

Re: [PATCH 1/2] MIPS: BCM47XX: select BOOT_RAW

[Kevin Cernekee]

On Sun, Sep 16, 2012 at 7:48 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
> All the boot loaders I have seen are booting the kernel in raw mode by
> default. CFE seams to support elf kernel images too, but the default

Nitpick: "seems"

> case is raw for the devices I know of. Select this option to make the
> kernel boot on most of the devices with the default options.

CONFIG_BOOT_RAW only adds about 8 bytes to the kernel image.  Since
early 2008 it's just been implemented as a single jump instruction,
and it's harmless on platforms that don't need it.

Do you think it is worthwhile to delete the Kconfig option, and enable
BOOT_RAW behavior on all builds?

Re: [PATCH 1/2] MIPS: BCM47XX: select BOOT_RAW

[Hauke Mehrtens]

On 09/16/2012 05:38 PM, Kevin Cernekee wrote:
> On Sun, Sep 16, 2012 at 7:48 AM, Hauke Mehrtens <hauke@hauke-m.de> wrote:
>> All the boot loaders I have seen are booting the kernel in raw mode by
>> default. CFE seams to support elf kernel images too, but the default
> 
> Nitpick: "seems"
> 
>> case is raw for the devices I know of. Select this option to make the
>> kernel boot on most of the devices with the default options.
> 
> CONFIG_BOOT_RAW only adds about 8 bytes to the kernel image.  Since
> early 2008 it's just been implemented as a single jump instruction,
> and it's harmless on platforms that don't need it.
> 
> Do you think it is worthwhile to delete the Kconfig option, and enable
> BOOT_RAW behavior on all builds?
> 
Ralf should I change the patch to activate BOOT_RAW on all builds like
Kevin suggested?

I just came up with the small change in these patches to make the
bcm47xx SoC boot again without any other patches.

Hauke