DA850 EVM: passing maximum clock rate information to kernel
The TI DA850/OMAP-L138/AM18x EVM can be populated with devices
having different maximum allowed CPU clock rating.
The maximum clock the chip can support can only be determined from
the label on the package (not software readable).
Introduce a method to pass the maximum allowed clock rate information
to kernel using ATAG_REVISION. The kernel uses this information to
determine the maximum cpu clock rate reachable using cpufreq.
Note that U-Boot itself does not set the CPU clock rate. The CPU
clock is setup by a primary bootloader ("UBL"). The rate setup by
UBL could be different from the maximum clock rate supported by the
device.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h
index 7b04be0..61c3205 100644
--- a/include/configs/da850evm.h
+++ b/include/configs/da850evm.h
@@ -140,6 +140,7 @@
*/
#define LINUX_BOOT_PARAM_ADDR (PHYS_SDRAM_1 + 0x100)
#define CONFIG_CMDLINE_TAG
+#define CONFIG_REVISION_TAG
#define CONFIG_SETUP_MEMORY_TAGS
#define CONFIG_BOOTARGS \
"mem=32M console=ttyS2,115200n8 root=/dev/mtdblock2 rw noinitrd ip=dhcp"