Re: [kvm-ppc-devel] [PATCH 7 of 7] Add ability to specify ram

[Hollis Blanchard <hollisb@us.ibm.com>]

On Fri, 2008-03-14 at 12:09 -0500, Jerone Young wrote:
> # HG changeset patch
> # User Jerone Young <jyoung5@us.ibm.com>
> # Date 1205514174 18000
> # Branch merge
> # Node ID 3060b75a9597d4ab67c23871df41fc5e5476df2b
> # Parent  63237bde74818a5dc3cdb1baee781dab101290ce
> Add ability to specify ram on command line for bamboo board model
> 
> This patch adds the ability to now specify ram sizes on the command line.
> Due to the nature of the code there are restictions on exactly how
> much ram and the multiple that the size must match.
> 
> Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
> 
> diff --git a/qemu/hw/ppc440_bamboo.c b/qemu/hw/ppc440_bamboo.c
> --- a/qemu/hw/ppc440_bamboo.c
> +++ b/qemu/hw/ppc440_bamboo.c
> @@ -40,32 +40,50 @@ void bamboo_init(ram_addr_t ram_size, in
>  	target_ulong dt_base=0;
>  	void *fdt;
>  	int ret;
> + 	unsigned long ram_sticks[] = {0, 0}; /* Value will be in bytes */
> +	ram_addr_t tmp_ram_size;
> +	int ram_stick_sizes[] = {256, 128, 64, 32, 16, 8 }; /* in Mega bytes */
> +	int i=0, k=0;
> 
>  	uint32_t cpu_freq;
>  	uint32_t timebase_freq;
> 
>  	printf("%s: START\n", __func__);
> 
> -	/* Setup Memory */
> -	if (ram_size) {
> -		printf("Ram size specified on command line is %i bytes\n",
> -								(int)ram_size);
> -		printf("WARNING: RAM is hard coded to 144MB\n");
> -	}
> -	else {
> -		printf("Using defualt ram size of %iMB\n",
> -						((int)ram_size/1024)/1024);
> + 	/* Setup Memory */
> + 	printf("Ram size passed is: %i MB\n",
> + 				((int)ram_size/1024)/1024); 		
> + 
> +	tmp_ram_size = ram_size;
> +
> +	for (i=0; i < (sizeof(ram_sticks)/sizeof(unsigned long)); i++)
> +	{
> +		for (k=0; k < (sizeof(ram_stick_sizes)/sizeof(int)); k++)
> +		{
> +			if ((((tmp_ram_size/1024)/1024)/ram_stick_sizes[k]) > 0)
> +			{
> +				ram_sticks[i] = ram_stick_sizes[k]*1024*1024;
> +				tmp_ram_size -= ram_stick_sizes[k]*1024*1024; 
> +				break;
> +			}
> +		}
> +	
>  	}

Please match the curly brace syntax used everywhere else.

Also, I don't think it makes any sense to multiply and divide by
1024*1024 everywhere; just use the proper units to begin with. Try N<<20
to represent N MB.

"tmp_ram_size" is also unnecessary; just subtract from "ram_size" and
see if it's non-zero at the end.

> -	/* Each bank can only have memory in configurations of
> -	 *   16MB, 32MB, 64MB, 128MB, or 256MB
> -	 */
> -	ram_bases[0] = 0x0;
> -	ram_sizes[0] = 0x08000000;
> -	ram_bases[1] = 0x0;
> -	ram_sizes[1] = 0x01000000;
> +	if (tmp_ram_size)
> +		printf("WARNING: %i left over memory is ram\n", 
> +			(tmp_ram_size/1024)/1024);
> 
> -	printf("Ram size of domain is %d bytes\n", (int)ram_size);
> + 	/* Each bank can only have memory in configurations of
> + 	 *   4MB, 8MB, 16MB, 32MB, 64MB, 128MB, or 256MB
> + 	 *   why? see sdram_bcr()
> + 	 *   
> + 	 *   Max of 512MB
> + 	 */
> + 	ram_bases[0] = 0x0;
> + 	ram_sizes[0] = ram_sticks[0];
> + 	ram_bases[1] = 0x0;
> + 	ram_sizes[1] = ram_sticks[1];

Why keep a separate ram_sticks[] array? Just operate directly on
ram_sizes[], and while you're at it stop hardcoding 2 entries: the SDRAM
controller can emulate all 4.

Also, ram_bases[1] here is very wrong; that definitely needs to be
fixed.

-- 
Hollis Blanchard
IBM Linux Technology Center


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