[U-Boot] [PATCH] arm: bugfix: Move vector table before jumping relocated code

Tetsuyuki Kobayashi
2012-06-26T01:03:01Z

Hello,

(06/26/2012 12:10 AM), Stephen Warren wrote:
> On 06/25/2012 06:40 AM, Tetsuyuki Kobayashi wrote:
>> Interrupts and exceptions doesn't work in relocated code.
>> It badly use IRQ_STACK_START_IN in rom area as interrupt stack.
>> It is because the vecotr table is not moved to ram area.
>> This patch moves vector table before jumping relocated code.
>>
>> Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
>
> CC'ing in some Tegra people.
>
> Tetsuyuki, you probably want to CC some OMAP people too.

Thank you.
I don't know proper person to CC because I am very new in this ML.
I need some help ..

'#if condition' in my patch is the same as the code setting VBAR right after reset.
(in file arch/arm/cpu/armv7/start.S)

>
>> ---
>> arch/arm/cpu/armv7/start.S | 12 ++++++++++++
>> 1 file changed, 12 insertions(+)
>>
>> diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
>> index 52f7f6e..5098f7b 100644
>> --- a/arch/arm/cpu/armv7/start.S
>> +++ b/arch/arm/cpu/armv7/start.S
>> @@ -277,6 +277,18 @@ jump_2_ram:
>> mcr p15, 0, r0, c7, c10, 4 @ DSB
>> mcr p15, 0, r0, c7, c5, 4 @ ISB
>> #endif
>> +/*
>> + * Move vector table
>> + */
>> +#if !defined(CONFIG_TEGRA2)
>> +#if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD))
>> + /* Set vector address in CP15 VBAR register */
>> + ldr r0, =_start
>> + add r0, r0, r9
>> + mcr p15, 0, r0, c12, c0, 0 @Set VBAR
>> +#endif
>> +#endif /* !Tegra2 */
>> +
>> ldr r0, _board_init_r_ofs
>> adr r1, _start
>> add lr, r0, r1
>
>