Sam Ravnborg wrote: > Konrad / Daniel - any inputs on why LEON uses a different ASI? > As we uses this in head_32.S this is really annoying... It is not difficult to change the MMU reg ASI from 0x19 to 0x4 (as defined in the SRMMU spec). However, all available LEON2/3/4 chips in production uses 0x19 due to a decision take about 10 years ago. ASI 4 was used for uncached access in the original MMU-less LEON2, hence the choice to use 0x19. In current LEON3/4 cores, ASI 4 is no longer used, so 0x19 could easily be replaced with 4. But removing the use of ASI 0x19 in the kernel will make it incompatible with all present chips. I will change the LEON3/4 IP's to double map the MMU ASI to both 4 and 0x19, but then we have to wait an other 10 years until the present chips are out of use before we can remove 0x19 from the kernel ... Jiri. > > Sam > -- > To unsubscribe from this list: send the line "unsubscribe sparclinux" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
