diff --git a/Makefile.objs b/Makefile.objs
index cebde3660..54a3e924c 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -138,6 +138,7 @@ hw-obj-$(CONFIG_NAND) += nand.o
 hw-obj-$(CONFIG_M48T59) += m48t59.o
 hw-obj-$(CONFIG_ESCC) += escc.o
 
+hw-obj-$(CONFIG_SERIAL) += serial.o
 hw-obj-$(CONFIG_PARALLEL) += parallel.o
 hw-obj-$(CONFIG_I8254) += i8254.o
 hw-obj-$(CONFIG_PCSPK) += pcspk.o
diff --git a/Makefile.target b/Makefile.target
index a48a2aafb..77787321d 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -197,7 +197,7 @@ obj-y += e1000.o
 obj-i386-y = ide/core.o
 obj-i386-y += pckbd.o $(sound-obj-y) dma.o
 obj-i386-y += vga.o
-obj-i386-y += mc146818rtc.o serial.o i8259.o pc.o
+obj-i386-y += mc146818rtc.o i8259.o pc.o
 obj-i386-y += cirrus_vga.o apic.o ioapic.o acpi.o piix_pci.o
 obj-i386-y += vmmouse.o vmport.o vmware_vga.o hpet.o
 obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
@@ -207,7 +207,7 @@ obj-i386-y += debugcon.o multiboot.o
 obj-ppc-y = ppc.o ide/core.o ide/macio.o
 obj-ppc-y += vga.o $(sound-obj-y) dma.o openpic.o
 # PREP target
-obj-ppc-y += pckbd.o serial.o i8259.o mc146818rtc.o
+obj-ppc-y += pckbd.o i8259.o mc146818rtc.o
 obj-ppc-y += prep_pci.o ppc_prep.o
 # Mac shared devices
 obj-ppc-y += macio.o cuda.o adb.o mac_nvram.o mac_dbdma.o
@@ -225,7 +225,7 @@ obj-ppc-$(CONFIG_FDT) += device_tree.o
 
 obj-mips-y = mips_r4k.o mips_jazz.o mips_malta.o mips_mipssim.o
 obj-mips-y += mips_addr.o mips_timer.o mips_int.o
-obj-mips-y += dma.o vga.o serial.o i8259.o rc4030.o
+obj-mips-y += dma.o vga.o i8259.o rc4030.o
 obj-mips-y += vga-isa-mm.o
 obj-mips-y += g364fb.o jazz_led.o dp8393x.o
 obj-mips-y += ide/core.o
@@ -263,7 +263,7 @@ ifeq ($(TARGET_ARCH), sparc64)
 obj-sparc-y = sun4u.o pckbd.o apb_pci.o
 obj-sparc-y += ide/core.o
 obj-sparc-y += vga.o
-obj-sparc-y += mc146818rtc.o serial.o
+obj-sparc-y += mc146818rtc.o
 obj-sparc-y += cirrus_vga.o
 else
 obj-sparc-y = sun4m.o lance.o tcx.o iommu.o slavio_intctl.o
@@ -281,7 +281,7 @@ obj-arm-y += arm-semi.o
 obj-arm-y += pxa2xx.o pxa2xx_pic.o pxa2xx_gpio.o pxa2xx_timer.o pxa2xx_dma.o
 obj-arm-y += pxa2xx_lcd.o pxa2xx_mmci.o pxa2xx_pcmcia.o pxa2xx_keypad.o
 obj-arm-y += pflash_cfi01.o gumstix.o
-obj-arm-y += zaurus.o ide/core.o ide/microdrive.o serial.o spitz.o tosa.o tc6393xb.o
+obj-arm-y += zaurus.o ide/core.o ide/microdrive.o spitz.o tosa.o tc6393xb.o
 obj-arm-y += omap1.o omap_lcdc.o omap_dma.o omap_clk.o omap_mmc.o omap_i2c.o
 obj-arm-y += omap2.o omap_dss.o soc_dma.o
 obj-arm-y += omap_sx1.o palm.o tsc210x.o
@@ -294,7 +294,7 @@ obj-arm-y += syborg_serial.o syborg_timer.o syborg_pointer.o syborg_rtc.o
 obj-arm-y += syborg_virtio.o
 
 obj-sh4-y = shix.o r2d.o sh7750.o sh7750_regnames.o tc58128.o
-obj-sh4-y += sh_timer.o sh_serial.o sh_intc.o sh_pci.o sm501.o serial.o
+obj-sh4-y += sh_timer.o sh_serial.o sh_intc.o sh_pci.o sm501.o
 obj-sh4-y += ide/core.o ide/mmio.o
 
 obj-m68k-y = an5206.o mcf5206.o mcf_uart.o mcf_intc.o mcf5208.o mcf_fec.o
diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
index 4c0fe2261..02ad192cc 100644
--- a/default-configs/arm-softmmu.mak
+++ b/default-configs/arm-softmmu.mak
@@ -5,6 +5,7 @@ CONFIG_USB_OHCI=y
 CONFIG_ISA_MMIO=y
 CONFIG_NAND=y
 CONFIG_ECC=y
+CONFIG_SERIAL=y
 CONFIG_PTIMER=y
 CONFIG_SD=y
 CONFIG_MAX7310=y
diff --git a/default-configs/i386-softmmu.mak b/default-configs/i386-softmmu.mak
index f599776b3..125513882 100644
--- a/default-configs/i386-softmmu.mak
+++ b/default-configs/i386-softmmu.mak
@@ -3,6 +3,7 @@
 CONFIG_USB_OHCI=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y
 CONFIG_PCSPK=y
diff --git a/default-configs/mips-softmmu.mak b/default-configs/mips-softmmu.mak
index 86549659e..5d1c0982e 100644
--- a/default-configs/mips-softmmu.mak
+++ b/default-configs/mips-softmmu.mak
@@ -4,6 +4,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESP=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y
 CONFIG_PCSPK=y
diff --git a/default-configs/mips64-softmmu.mak b/default-configs/mips64-softmmu.mak
index c2d396d13..b9a342dad 100644
--- a/default-configs/mips64-softmmu.mak
+++ b/default-configs/mips64-softmmu.mak
@@ -4,6 +4,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESP=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y
 CONFIG_PCSPK=y
diff --git a/default-configs/mips64el-softmmu.mak b/default-configs/mips64el-softmmu.mak
index 61d95068d..cb957ce2d 100644
--- a/default-configs/mips64el-softmmu.mak
+++ b/default-configs/mips64el-softmmu.mak
@@ -4,6 +4,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESP=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y
 CONFIG_PCSPK=y
diff --git a/default-configs/mipsel-softmmu.mak b/default-configs/mipsel-softmmu.mak
index cf4121c94..7ff0f0333 100644
--- a/default-configs/mipsel-softmmu.mak
+++ b/default-configs/mipsel-softmmu.mak
@@ -4,6 +4,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESP=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y
 CONFIG_PCSPK=y
diff --git a/default-configs/ppc-softmmu.mak b/default-configs/ppc-softmmu.mak
index d075e893e..8b6be33e5 100644
--- a/default-configs/ppc-softmmu.mak
+++ b/default-configs/ppc-softmmu.mak
@@ -6,6 +6,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESCC=y
 CONFIG_M48T59=y
 CONFIG_VGA_PCI=y
+CONFIG_SERIAL=y
 CONFIG_I8254=y
 CONFIG_FDC=y
 CONFIG_IDE_QDEV=y
diff --git a/default-configs/ppc64-softmmu.mak b/default-configs/ppc64-softmmu.mak
index e452bcdaf..a8bfdb01a 100644
--- a/default-configs/ppc64-softmmu.mak
+++ b/default-configs/ppc64-softmmu.mak
@@ -6,6 +6,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESCC=y
 CONFIG_M48T59=y
 CONFIG_VGA_PCI=y
+CONFIG_SERIAL=y
 CONFIG_I8254=y
 CONFIG_FDC=y
 CONFIG_IDE_QDEV=y
diff --git a/default-configs/ppcemb-softmmu.mak b/default-configs/ppcemb-softmmu.mak
index 7b8b63e15..a63e3043c 100644
--- a/default-configs/ppcemb-softmmu.mak
+++ b/default-configs/ppcemb-softmmu.mak
@@ -6,6 +6,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_ESCC=y
 CONFIG_M48T59=y
 CONFIG_VGA_PCI=y
+CONFIG_SERIAL=y
 CONFIG_I8254=y
 CONFIG_FDC=y
 CONFIG_IDE_QDEV=y
diff --git a/default-configs/sh4-softmmu.mak b/default-configs/sh4-softmmu.mak
index 4f912eccd..79a419592 100644
--- a/default-configs/sh4-softmmu.mak
+++ b/default-configs/sh4-softmmu.mak
@@ -1,4 +1,5 @@
 # Default configuration for sh4-softmmu
 
 CONFIG_USB_OHCI=y
+CONFIG_SERIAL=y
 CONFIG_PTIMER=y
diff --git a/default-configs/sh4eb-softmmu.mak b/default-configs/sh4eb-softmmu.mak
index 93d0c76f2..73af23b9c 100644
--- a/default-configs/sh4eb-softmmu.mak
+++ b/default-configs/sh4eb-softmmu.mak
@@ -1,4 +1,5 @@
 # Default configuration for sh4eb-softmmu
 
 CONFIG_USB_OHCI=y
+CONFIG_SERIAL=y
 CONFIG_PTIMER=y
diff --git a/default-configs/sparc64-softmmu.mak b/default-configs/sparc64-softmmu.mak
index d165132b3..14aab353c 100644
--- a/default-configs/sparc64-softmmu.mak
+++ b/default-configs/sparc64-softmmu.mak
@@ -4,6 +4,7 @@ CONFIG_ISA_MMIO=y
 CONFIG_M48T59=y
 CONFIG_PTIMER=y
 CONFIG_VGA_PCI=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_FDC=y
 CONFIG_IDE_QDEV=y
diff --git a/default-configs/x86_64-softmmu.mak b/default-configs/x86_64-softmmu.mak
index 951c1b2a9..545052fc3 100644
--- a/default-configs/x86_64-softmmu.mak
+++ b/default-configs/x86_64-softmmu.mak
@@ -3,6 +3,7 @@
 CONFIG_USB_OHCI=y
 CONFIG_VGA_PCI=y
 CONFIG_VGA_ISA=y
+CONFIG_SERIAL=y
 CONFIG_PARALLEL=y
 CONFIG_I8254=y
 CONFIG_PCSPK=y
diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index ea74ea4ed..e8a81b122 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -254,10 +254,20 @@ void mips_jazz_init (ram_addr_t ram_size,
     i8042_mm_init(rc4030[6], rc4030[7], 0x80005000, 0x1000, 0x1);
 
     /* Serial ports */
-    if (serial_hds[0])
-        serial_mm_init(0x80006000, 0, rc4030[8], 8000000/16, serial_hds[0], 1);
-    if (serial_hds[1])
-        serial_mm_init(0x80007000, 0, rc4030[9], 8000000/16, serial_hds[1], 1);
+    if (serial_hds[0]) {
+#ifdef TARGET_WORDS_BIGENDIAN
+        serial_mm_init(0x80006000, 0, rc4030[8], 8000000/16, serial_hds[0], 1, 1);
+#else
+        serial_mm_init(0x80006000, 0, rc4030[8], 8000000/16, serial_hds[0], 1, 0);
+#endif
+    }
+    if (serial_hds[1]) {
+#ifdef TARGET_WORDS_BIGENDIAN
+        serial_mm_init(0x80007000, 0, rc4030[9], 8000000/16, serial_hds[1], 1, 1);
+#else
+        serial_mm_init(0x80007000, 0, rc4030[9], 8000000/16, serial_hds[1], 1, 0);
+#endif
+    }
 
     /* Parallel port */
     if (parallel_hds[0])
diff --git a/hw/mips_malta.c b/hw/mips_malta.c
index 91498c262..96e3bc032 100644
--- a/hw/mips_malta.c
+++ b/hw/mips_malta.c
@@ -441,7 +441,11 @@ static MaltaFPGAState *malta_fpga_init(target_phys_addr_t base, qemu_irq uart_ir
 
     s->display = qemu_chr_open("fpga", "vc:320x200", malta_fpga_led_init);
 
-    s->uart = serial_mm_init(base + 0x900, 3, uart_irq, 230400, uart_chr, 1);
+#ifdef TARGET_WORDS_BIGENDIAN
+    s->uart = serial_mm_init(base + 0x900, 3, uart_irq, 230400, uart_chr, 1, 1);
+#else
+    s->uart = serial_mm_init(base + 0x900, 3, uart_irq, 230400, uart_chr, 1, 0);
+#endif
 
     malta_fpga_reset(s);
     qemu_register_reset(malta_fpga_reset, s);
diff --git a/hw/musicpal.c b/hw/musicpal.c
index b8af15ed5..7fc9fb37c 100644
--- a/hw/musicpal.c
+++ b/hw/musicpal.c
@@ -1525,12 +1525,22 @@ static void musicpal_init(ram_addr_t ram_size,
                           pic[MP_TIMER4_IRQ], NULL);
 
     if (serial_hds[0]) {
+#ifdef TARGET_WORDS_BIGENDIAN
         serial_mm_init(MP_UART1_BASE, 2, pic[MP_UART1_IRQ], 1825000,
-                   serial_hds[0], 1);
+                       serial_hds[0], 1, 1);
+#else
+        serial_mm_init(MP_UART1_BASE, 2, pic[MP_UART1_IRQ], 1825000,
+                       serial_hds[0], 1, 0);
+#endif
     }
     if (serial_hds[1]) {
+#ifdef TARGET_WORDS_BIGENDIAN
         serial_mm_init(MP_UART2_BASE, 2, pic[MP_UART2_IRQ], 1825000,
-                   serial_hds[1], 1);
+                       serial_hds[1], 1, 1);
+#else
+        serial_mm_init(MP_UART2_BASE, 2, pic[MP_UART2_IRQ], 1825000,
+                       serial_hds[1], 1, 0);
+#endif
     }
 
     /* Register flash */
diff --git a/hw/omap1.c b/hw/omap1.c
index b5d78cd91..a554d905f 100644
--- a/hw/omap1.c
+++ b/hw/omap1.c
@@ -1986,9 +1986,15 @@ struct omap_uart_s *omap_uart_init(target_phys_addr_t base,
     s->base = base;
     s->fclk = fclk;
     s->irq = irq;
+#ifdef TARGET_WORDS_BIGENDIAN
     s->serial = serial_mm_init(base, 2, irq, omap_clk_getrate(fclk)/16,
-                               chr ?: qemu_chr_open("null", "null", NULL), 1);
-
+                               chr ?: qemu_chr_open("null", "null", NULL), 1,
+                               1);
+#else
+    s->serial = serial_mm_init(base, 2, irq, omap_clk_getrate(fclk)/16,
+                               chr ?: qemu_chr_open("null", "null", NULL), 1,
+                               0);
+#endif
     return s;
 }
 
@@ -2101,9 +2107,17 @@ struct omap_uart_s *omap2_uart_init(struct omap_target_agent_s *ta,
 void omap_uart_attach(struct omap_uart_s *s, CharDriverState *chr)
 {
     /* TODO: Should reuse or destroy current s->serial */
+#ifdef TARGET_WORDS_BIGENDIAN
     s->serial = serial_mm_init(s->base, 2, s->irq,
-                    omap_clk_getrate(s->fclk) / 16,
-                    chr ?: qemu_chr_open("null", "null", NULL), 1);
+                               omap_clk_getrate(s->fclk) / 16,
+                               chr ?: qemu_chr_open("null", "null", NULL), 1,
+                               1);
+#else
+    s->serial = serial_mm_init(s->base, 2, s->irq,
+                               omap_clk_getrate(s->fclk) / 16,
+                               chr ?: qemu_chr_open("null", "null", NULL), 1,
+                               0);
+#endif
 }
 
 /* MPU Clock/Reset/Power Mode Control */
diff --git a/hw/pc.h b/hw/pc.h
index 5bbe39abf..7f1b8ee12 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -12,7 +12,8 @@ SerialState *serial_init(int base, qemu_irq irq, int baudbase,
                          CharDriverState *chr);
 SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
                              qemu_irq irq, int baudbase,
-                             CharDriverState *chr, int ioregister);
+                             CharDriverState *chr, int ioregister,
+                             int be);
 SerialState *serial_isa_init(int index, CharDriverState *chr);
 void serial_set_frequency(SerialState *s, uint32_t frequency);
 
diff --git a/hw/ppc405_uc.c b/hw/ppc405_uc.c
index bfcb79144..df698a88e 100644
--- a/hw/ppc405_uc.c
+++ b/hw/ppc405_uc.c
@@ -2182,11 +2182,11 @@ CPUState *ppc405cr_init (target_phys_addr_t ram_bases[4],
     /* Serial ports */
     if (serial_hds[0] != NULL) {
         serial_mm_init(0xef600300, 0, pic[0], PPC_SERIAL_MM_BAUDBASE,
-                       serial_hds[0], 1);
+                       serial_hds[0], 1, 1);
     }
     if (serial_hds[1] != NULL) {
         serial_mm_init(0xef600400, 0, pic[1], PPC_SERIAL_MM_BAUDBASE,
-                       serial_hds[1], 1);
+                       serial_hds[1], 1, 1);
     }
     /* IIC controller */
     ppc405_i2c_init(0xef600500, pic[2]);
@@ -2535,11 +2535,11 @@ CPUState *ppc405ep_init (target_phys_addr_t ram_bases[2],
     /* Serial ports */
     if (serial_hds[0] != NULL) {
         serial_mm_init(0xef600300, 0, pic[0], PPC_SERIAL_MM_BAUDBASE,
-                       serial_hds[0], 1);
+                       serial_hds[0], 1, 1);
     }
     if (serial_hds[1] != NULL) {
         serial_mm_init(0xef600400, 0, pic[1], PPC_SERIAL_MM_BAUDBASE,
-                       serial_hds[1], 1);
+                       serial_hds[1], 1, 1);
     }
     /* OCM */
     ppc405_ocm_init(env);
diff --git a/hw/ppc440.c b/hw/ppc440.c
index 2ee7aea0e..d12cf7181 100644
--- a/hw/ppc440.c
+++ b/hw/ppc440.c
@@ -89,11 +89,11 @@ CPUState *ppc440ep_init(ram_addr_t *ram_size, PCIBus **pcip,
 
     if (serial_hds[0] != NULL) {
         serial_mm_init(0xef600300, 0, pic[0], PPC_SERIAL_MM_BAUDBASE,
-                       serial_hds[0], 1);
+                       serial_hds[0], 1, 1);
     }
     if (serial_hds[1] != NULL) {
         serial_mm_init(0xef600400, 0, pic[1], PPC_SERIAL_MM_BAUDBASE,
-                       serial_hds[1], 1);
+                       serial_hds[1], 1, 1);
     }
 
     return env;
diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 491ea7a07..0901fa6ff 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -198,15 +198,17 @@ static void mpc8544ds_init(ram_addr_t ram_size,
     mpic = mpic_init(MPC8544_MPIC_REGS_BASE, 1, &irqs, NULL);
 
     /* Serial */
-    if (serial_hds[0])
+    if (serial_hds[0]) {
         serial[0] = serial_mm_init(MPC8544_SERIAL0_REGS_BASE,
-                               0, mpic[12+26], 399193,
-                        serial_hds[0], 1);
+                                   0, mpic[12+26], 399193,
+                                   serial_hds[0], 1, 1);
+    }
 
-    if (serial_hds[1])
+    if (serial_hds[1]) {
         serial[0] = serial_mm_init(MPC8544_SERIAL1_REGS_BASE,
-                        0, mpic[12+26], 399193,
-                        serial_hds[0], 1);
+                                   0, mpic[12+26], 399193,
+                                   serial_hds[0], 1, 1);
+    }
 
     /* PCI */
     pci_irqs = qemu_malloc(sizeof(qemu_irq) * 4);
diff --git a/hw/pxa2xx.c b/hw/pxa2xx.c
index f8292e7cf..705c36983 100644
--- a/hw/pxa2xx.c
+++ b/hw/pxa2xx.c
@@ -2076,9 +2076,15 @@ PXA2xxState *pxa270_init(unsigned int sdram_size, const char *revision)
 
     for (i = 0; pxa270_serial[i].io_base; i ++)
         if (serial_hds[i])
+#ifdef TARGET_WORDS_BIGENDIAN
             serial_mm_init(pxa270_serial[i].io_base, 2,
                            s->pic[pxa270_serial[i].irqn], 14857000/16,
-                           serial_hds[i], 1);
+                           serial_hds[i], 1, 1);
+#else
+            serial_mm_init(pxa270_serial[i].io_base, 2,
+                           s->pic[pxa270_serial[i].irqn], 14857000/16,
+                           serial_hds[i], 1, 1);
+#endif
         else
             break;
     if (serial_hds[i])
@@ -2187,12 +2193,19 @@ PXA2xxState *pxa255_init(unsigned int sdram_size)
                               s->pic[PXA2XX_PIC_MMC], s->dma);
 
     for (i = 0; pxa255_serial[i].io_base; i ++)
-        if (serial_hds[i])
+        if (serial_hds[i]) {
+#ifdef TARGET_WORDS_BIGENDIAN
             serial_mm_init(pxa255_serial[i].io_base, 2,
                            s->pic[pxa255_serial[i].irqn], 14745600/16,
-                           serial_hds[i], 1);
-        else
+                           serial_hds[i], 1, 1);
+#else
+            serial_mm_init(pxa255_serial[i].io_base, 2,
+                           s->pic[pxa255_serial[i].irqn], 14745600/16,
+                           serial_hds[i], 1, 0);
+#endif
+        } else {
             break;
+        }
     if (serial_hds[i])
         s->fir = pxa2xx_fir_init(0x40800000, s->pic[PXA2XX_PIC_ICP],
                         s->dma, serial_hds[i]);
diff --git a/hw/serial.c b/hw/serial.c
index f3ec36a97..90213c465 100644
--- a/hw/serial.c
+++ b/hw/serial.c
@@ -825,65 +825,106 @@ static void serial_mm_writeb(void *opaque, target_phys_addr_t addr,
     serial_ioport_write(s, addr >> s->it_shift, value & 0xFF);
 }
 
-static uint32_t serial_mm_readw(void *opaque, target_phys_addr_t addr)
+static uint32_t serial_mm_readw_be(void *opaque, target_phys_addr_t addr)
 {
     SerialState *s = opaque;
     uint32_t val;
 
     val = serial_ioport_read(s, addr >> s->it_shift) & 0xFFFF;
-#ifdef TARGET_WORDS_BIGENDIAN
     val = bswap16(val);
-#endif
     return val;
 }
 
-static void serial_mm_writew(void *opaque, target_phys_addr_t addr,
-                             uint32_t value)
+static uint32_t serial_mm_readw_le(void *opaque, target_phys_addr_t addr)
 {
     SerialState *s = opaque;
-#ifdef TARGET_WORDS_BIGENDIAN
+    uint32_t val;
+
+    val = serial_ioport_read(s, addr >> s->it_shift) & 0xFFFF;
+    return val;
+}
+
+static void serial_mm_writew_be(void *opaque, target_phys_addr_t addr,
+                                uint32_t value)
+{
+    SerialState *s = opaque;
+
     value = bswap16(value);
-#endif
     serial_ioport_write(s, addr >> s->it_shift, value & 0xFFFF);
 }
 
-static uint32_t serial_mm_readl(void *opaque, target_phys_addr_t addr)
+static void serial_mm_writew_le(void *opaque, target_phys_addr_t addr,
+                                uint32_t value)
+{
+    SerialState *s = opaque;
+
+    serial_ioport_write(s, addr >> s->it_shift, value & 0xFFFF);
+}
+
+static uint32_t serial_mm_readl_be(void *opaque, target_phys_addr_t addr)
 {
     SerialState *s = opaque;
     uint32_t val;
 
     val = serial_ioport_read(s, addr >> s->it_shift);
-#ifdef TARGET_WORDS_BIGENDIAN
     val = bswap32(val);
-#endif
     return val;
 }
 
-static void serial_mm_writel(void *opaque, target_phys_addr_t addr,
-                             uint32_t value)
+static uint32_t serial_mm_readl_le(void *opaque, target_phys_addr_t addr)
 {
     SerialState *s = opaque;
-#ifdef TARGET_WORDS_BIGENDIAN
+    uint32_t val;
+
+    val = serial_ioport_read(s, addr >> s->it_shift);
+    return val;
+}
+
+static void serial_mm_writel_be(void *opaque, target_phys_addr_t addr,
+                                uint32_t value)
+{
+    SerialState *s = opaque;
+
     value = bswap32(value);
-#endif
     serial_ioport_write(s, addr >> s->it_shift, value);
 }
 
-static CPUReadMemoryFunc * const serial_mm_read[] = {
+static void serial_mm_writel_le(void *opaque, target_phys_addr_t addr,
+                                uint32_t value)
+{
+    SerialState *s = opaque;
+
+    serial_ioport_write(s, addr >> s->it_shift, value);
+}
+
+static CPUReadMemoryFunc * const serial_mm_read_be[] = {
     &serial_mm_readb,
-    &serial_mm_readw,
-    &serial_mm_readl,
+    &serial_mm_readw_be,
+    &serial_mm_readl_be,
 };
 
-static CPUWriteMemoryFunc * const serial_mm_write[] = {
+static CPUWriteMemoryFunc * const serial_mm_write_be[] = {
     &serial_mm_writeb,
-    &serial_mm_writew,
-    &serial_mm_writel,
+    &serial_mm_writew_be,
+    &serial_mm_writel_be,
+};
+
+static CPUReadMemoryFunc * const serial_mm_read_le[] = {
+    &serial_mm_readb,
+    &serial_mm_readw_le,
+    &serial_mm_readl_le,
+};
+
+static CPUWriteMemoryFunc * const serial_mm_write_le[] = {
+    &serial_mm_writeb,
+    &serial_mm_writew_le,
+    &serial_mm_writel_le,
 };
 
 SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
                              qemu_irq irq, int baudbase,
-                             CharDriverState *chr, int ioregister)
+                             CharDriverState *chr, int ioregister,
+                             int be)
 {
     SerialState *s;
     int s_io_memory;
@@ -899,8 +940,13 @@ SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
     vmstate_register(base, &vmstate_serial, s);
 
     if (ioregister) {
-        s_io_memory = cpu_register_io_memory(serial_mm_read,
-                                             serial_mm_write, s);
+        if (be) {
+            s_io_memory = cpu_register_io_memory(serial_mm_read_be,
+                                                 serial_mm_write_be, s);
+        } else {
+            s_io_memory = cpu_register_io_memory(serial_mm_read_le,
+                                                 serial_mm_write_le, s);
+        }
         cpu_register_physical_memory(base, 8 << it_shift, s_io_memory);
     }
     serial_update_msl(s);
diff --git a/hw/sm501.c b/hw/sm501.c
index 80185864c..1a342bdc5 100644
--- a/hw/sm501.c
+++ b/hw/sm501.c
@@ -1226,10 +1226,17 @@ void sm501_init(uint32_t base, uint32_t local_mem_bytes, qemu_irq irq,
                         2, -1, irq);
 
     /* bridge to serial emulation module */
-    if (chr)
-	serial_mm_init(base + MMIO_BASE_OFFSET + SM501_UART0, 2,
-		       NULL, /* TODO : chain irq to IRL */
-		       115200, chr, 1);
+    if (chr) {
+#ifdef TARGET_WORDS_BIGENDIAN
+        serial_mm_init(base + MMIO_BASE_OFFSET + SM501_UART0, 2,
+                       NULL, /* TODO : chain irq to IRL */
+                       115200, chr, 1, 1);
+#else
+        serial_mm_init(base + MMIO_BASE_OFFSET + SM501_UART0, 2,
+                       NULL, /* TODO : chain irq to IRL */
+                       115200, chr, 1, 0);
+#endif
+    }
 
     /* create qemu graphic console */
     s->ds = graphic_console_init(sm501_update_display, NULL,
diff --git a/hw/sun4u.c b/hw/sun4u.c
index 260c5913f..24ea367d1 100644
--- a/hw/sun4u.c
+++ b/hw/sun4u.c
@@ -771,7 +771,7 @@ static void sun4uv_init(ram_addr_t RAM_size,
     i = 0;
     if (hwdef->console_serial_base) {
         serial_mm_init(hwdef->console_serial_base, 0, NULL, 115200,
-                       serial_hds[i], 1);
+                       serial_hds[i], 1, 1);
         i++;
     }
     for(; i < MAX_SERIAL_PORTS; i++) {