On 08/10/2017 10:46 PM, Priyanka Jain wrote:
-----Original Message----- From: York Sun Sent: Wednesday, August 09, 2017 10:19 PM To: Priyanka Jain priyanka.jain@nxp.com; u-boot@lists.denx.de Cc: Ashish Kumar ashish.kumar@nxp.com Subject: Re: [PATCH] drivers:net:fsl-mc: Update MC address calculation
On 06/23/2017 03:30 AM, Priyanka Jain wrote:
Update MC address caluclation as per MC design requirement of address as least significant 512MB address of MC private allocated memory.
Signed-off-by: Priyanka Jain priyanka.jain@nxp.com Signed-off-by: Ashish Kumar ashish.kumar@nxp.com
drivers/net/fsl-mc/mc.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/net/fsl-mc/mc.c b/drivers/net/fsl-mc/mc.c index eeecb2d..623586c 100644 --- a/drivers/net/fsl-mc/mc.c +++ b/drivers/net/fsl-mc/mc.c @@ -704,10 +704,15 @@ int get_dpl_apply_status(void)
/** * Return the MC address of private DRAM block.
- MC address should be least significant 512MB address
u64 mc_get_dram_addr(void) {
- of MC private memory */
- return gd->arch.resv_ram;
size_t mc_ram_size = mc_get_dram_block_size();
return (gd->arch.resv_ram + mc_ram_size - 1) &
MC_RAM_BASE_ADDR_ALIGNMENT_MASK;}
/**
Priyanka,
This looks odd. You already have the address aligned by CONFIG_SYS_MC_RSV_MEM_ALIGN (512MB by default), tracked by gd->arch.resv_ram. Did you find the address is wrong sometimes?
York
York,
As per MC design requirement, MC memory should be 512MB aligned for which start address is gd->arch.resv_ram. But the MC core’s initial boot address should not contain start address. It must be located in the least significant 512MB of its address range. So this change is basically shifting address from start of memory towards end of Memory (which is least significant 512MB address).
Priyanka,
You confused me. The reserved memory tracked by gd->arch.resv_ram is the beginning of the memory, aligned to 512MB (CONFIG_SYS_MC_RSV_MEM_ALIGN). It is naturally the lowest address in the reserved block. Isn't it "least significant"? If this involves complicated address allocation, please follow up with me for in-depth internal discussion.
York