PRCM_MBOX_HEADER_REQ_MB4
writeb(MB4H_MEM_ST, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
writeb(MB4H_HOTDOG, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
writeb(MB4H_HOTMON, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
writeb(MB4H_HOT_PERIOD, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
writeb(cmd, (tcdm_base + PRCM_MBOX_HEADER_REQ_MB4));
header = readb(tcdm_base + PRCM_MBOX_HEADER_REQ_MB4);