[ts-7000] Easy 32-bit read operation question

[Matt Godbolt <>]

On Wed, Jun 3, 2009 at 5:52 PM, alexdavisspecial
<> wrote:
>
>
> Hey group!
> I currently have this JNI write byte operation:
>
> JNIEXPORT jint JNICALL 
> Java_com_nextbus_signcontroller_mvc_TechnologicHAL_mmapWriteByte
> (JNIEnv *env, jclass obj, jint address, jbyte value)
> {
> /* Use mmap() to map memory, then write byte to address */
> off_t page;
> volatile unsigned char *start;
> int ret;
> int fd;
>
> fd = open("/dev/mem", O_RDWR);

I'm not sure about 32-bitness, but I'm pretty sure you need O_SYNC in
here to get an uncached memory pointer.
-- 
Matt
Sent from London, Eng, United Kingdom


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