Yes, ioremap() maps the given physical address to contiguous Kernel virtual address above high_memory and returns the first address of the mapped kernel virtual address.
Regards,
Prabhu
Regards,
Prabhu
On Thu, Feb 28, 2013 at 4:06 PM, sandeep kumar <coolsandyforyou@xxxxxxxxx> wrote:
Hi AllPlease find a piece of code that i wrote in my driver,With regards,void __iomem *tcpm_base = ioremap_nocache(0x03900000, SZ_16KB);printk("Virtual addresss %x\n",tcpm_base);if(tcpm_base!=NULL){printk("Jiffies %x %ld\n\n\n\n", jiffies, jiffies);for(i=0;i<(SZ_16KB-1);i++)src = "">printk("%d\n",src);printk("Jiffies %x %ld\n\n\n\n", jiffies, jiffies);}elseprintk("unable to map \n");When i execute this code, i am seeing a kernel panic telling----- LOG --------"Virtual addresss ea880000""Unable to handle kernel paging request at virtual address ea890000"-----LOG-----
If you observe,virtual address of tcpm_base is ea880000.if ioremap() returns all contigious memory, There should be no dereferencing of "ea890000"(the max address should be ea88fffe)But in kernel logs show, it is dereferencing that address.
My question now is...doesn't ioremap() returns contigious address space?
Sandeep Kumar Anantapalli,
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