[U-Boot] [PATCH 7/8] armv7: adapt omap3 to the new cache maintenance framework

[Aneesh V]

Dear Wolfgang,

On Monday 10 January 2011 04:27 AM, Wolfgang Denk wrote:
> Dear Aneesh V,
>
> In message<1293018898-13253-8-git-send-email-aneesh at ti.com>  you wrote:
>> adapt omap3 to the new layered cache maintenance framework
> ...
>
>> +/* Declarations */
>
> Please drop this comment.  Everybody sees what this is.

ok.

>
>> +#ifndef CONFIG_L2_OFF
>>   	/*
>> -	 * Writing to AuxCR in U-boot using SMI for GP DEV
>> -	 * Currently SMI in Kernel on ES2 devices seems to have an issue
>> -	 * Once that is resolved, we can postpone this config to kernel
>> +	 * Invalidate L2-cache from secure mode
>>   	 */
>
> Why not change this into simple
>
> 	/* Invalidate L2-cache from secure mode */
>
> ?

ok.

>
> ...
>> +static void omap3_emu_romcode_call(u32 service_id, u32 *parameters)
>> +{
>> +	u32 i, num_params = *parameters;
>> +	u32 *sram_scratch_space = (u32 *)OMAP3_PUBLIC_SRAM_SCRATCH_AREA;
>> +	/*
>> +	 * copy the parameters to an un-cached area to avoid coherency
>> +	 * issues
>> +	 */
>> +	for (i = 0; i<  num_params; i++) {
>> +		__raw_writel(*parameters, sram_scratch_space);
>> +		parameters++;
>> +		sram_scratch_space++;
>> +	}
>
> Do you have unlimited storage there?  Or should you add some check not
> to exceed some maximum size?

Number of params is typically 1 or 2. We should have enough space
unless the usage is wrong.

>
>> +	} else {
>> +		struct emu_hal_params emu_romcode_params;
>> +		emu_romcode_params.num_params = 1;
>> +		emu_romcode_params.param1 = acr;
>> +		omap3_emu_romcode_call(OMAP3_EMU_HAL_API_WRITE_ACR,
>> +				       (u32 *)&emu_romcode_params);
>
> Please add a blank line between declarations and code (fix globally).

ok.

>
>> +static void omap3_setup_aux_cr(void)
>> +{
>> +	/* Workaround for Cortex-A8 errata: #454179 #430973
>> +	 *	Set "IBE" bit
> ...
> Incorrect multiline comment style.

Will correct it.

>
> ...
>> diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h b/arch/arm/include/asm/arch-omap3/sys_proto.h
>> index 4a28ba1..25f54ea 100644
>> --- a/arch/arm/include/asm/arch-omap3/sys_proto.h
>> +++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
>> @@ -27,6 +27,11 @@ typedef struct {
>>   	char *nand_string;
>>   } omap3_sysinfo;
>>
>> +struct __attribute__ ((__packed__)) emu_hal_params {
>> +	u32 num_params;
>> +	u32 param1;
>> +};
>
> Why exactly do we need the "__attribute__ ((__packed__))" here?

Because a pointer to it has to be passed to ROM code and ROM code
wouldn't expect any padding.

>
>
> Best regards,
>
> Wolfgang Denk
>

Best regards,
Aneesh