Re: [Qemu-devel] [PATCH v2 8/8] hw/mips: MIPS Boston board support

[Yongbok Kim <yongbok.kim@imgtec.com>]

On 08/09/2016 15:51, Paul Burton wrote:
> Introduce support for emulating the MIPS Boston development board. The
> Boston board is built around an FPGA & 3 PCIe controllers, one of which
> is connected to an Intel EG20T Platform Controller Hub. It is used
> during the development & debug of new CPUs and the software intended to
> run on them, and is essentially the successor to the older MIPS Malta
> board.
> 
> This patch does not implement the EG20T, instead connecting an already
> supported ICH-9 AHCI controller. Whilst this isn't accurate it's enough
> for typical stock Boston software (eg. Linux kernels) to work with hard
> disks given that both the ICH-9 & EG20T implement the AHCI
> specification.
> 
> Boston boards typically boot kernels in the FIT image format, and this
> patch will treat kernels provided to QEMU as such. When loading a kernel
> directly, the board code will generate minimal firmware much as the
> Malta board code does. This firmware will set up the CM, CPC & GIC
> register base addresses then set argument registers & jump to the kernel
> entry point. Alternatively, bootloader code may be loaded using the bios
> argument in which case no firmware will be generated & execution will
> proceed from the start of the boot code at the default MIPS boot
> exception vector (offset 0x1fc00000 into (c)kseg1).
> 
> Currently real Boston boards are always used with FPGA bitfiles that
> include a Global Interrupt Controller (GIC), so the interrupt
> configuration is only defined for such cases. Therefore the board will
> only allow use of CPUs which implement the CPS components, including the
> GIC, and will otherwise exit with a message.
> 
> Signed-off-by: Paul Burton <paul.burton@imgtec.com>
> ---
> Changes in v2:
> - Require libfdt for mips*-softmmu builds, so that the FIT loader can be used.
> ---
>  configure                               |   2 +-
>  default-configs/mips-softmmu-common.mak |   2 +
>  hw/mips/Makefile.objs                   |   1 +
>  hw/mips/boston.c                        | 526 ++++++++++++++++++++++++++++++++
>  4 files changed, 530 insertions(+), 1 deletion(-)
>  create mode 100644 hw/mips/boston.c
> 
> diff --git a/configure b/configure
> index 1c4e117..242a113 100755
> --- a/configure
> +++ b/configure
> @@ -3308,7 +3308,7 @@ fi
>  fdt_required=no
>  for target in $target_list; do
>    case $target in
> -    aarch64*-softmmu|arm*-softmmu|ppc*-softmmu|microblaze*-softmmu)
> +    aarch64*-softmmu|arm*-softmmu|ppc*-softmmu|microblaze*-softmmu|mips*-softmmu)

As I mentioned earlier email, bigendian target doesn't work correctly. it
has be little endian only for now.

>        fdt_required=yes
>      ;;
>    esac
> diff --git a/default-configs/mips-softmmu-common.mak b/default-configs/mips-softmmu-common.mak
> index 0394514..09b7334 100644
> --- a/default-configs/mips-softmmu-common.mak
> +++ b/default-configs/mips-softmmu-common.mak
> @@ -32,3 +32,5 @@ CONFIG_ISA_TESTDEV=y
>  CONFIG_EMPTY_SLOT=y
>  CONFIG_MIPS_CPS=y
>  CONFIG_MIPS_ITU=y
> +CONFIG_MIPS_BOSTON=y
> +CONFIG_PCI_XILINX=y
> diff --git a/hw/mips/Makefile.objs b/hw/mips/Makefile.objs
> index 9352a1c..48cd2ef 100644
> --- a/hw/mips/Makefile.objs
> +++ b/hw/mips/Makefile.objs
> @@ -4,3 +4,4 @@ obj-$(CONFIG_JAZZ) += mips_jazz.o
>  obj-$(CONFIG_FULONG) += mips_fulong2e.o
>  obj-y += gt64xxx_pci.o
>  obj-$(CONFIG_MIPS_CPS) += cps.o
> +obj-$(CONFIG_MIPS_BOSTON) += boston.o
> diff --git a/hw/mips/boston.c b/hw/mips/boston.c
> new file mode 100644
> index 0000000..4e02907
> --- /dev/null
> +++ b/hw/mips/boston.c
> @@ -0,0 +1,526 @@
> +/*
> + * MIPS Boston development board emulation.
> + *
> + * Copyright (c) 2016 Imagination Technologies
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu-common.h"
> +
> +#include "exec/address-spaces.h"
> +#include "hw/boards.h"
> +#include "hw/char/serial.h"
> +#include "hw/hw.h"
> +#include "hw/ide/pci.h"
> +#include "hw/ide/ahci.h"
> +#include "hw/loader.h"
> +#include "hw/loader-fit.h"
> +#include "hw/mips/cps.h"
> +#include "hw/mips/cpudevs.h"
> +#include "hw/pci-host/xilinx-pcie.h"
> +#include "qapi/error.h"
> +#include "qemu/cutils.h"
> +#include "qemu/error-report.h"
> +#include "qemu/log.h"
> +#include "sysemu/char.h"
> +#include "sysemu/device_tree.h"
> +#include "sysemu/sysemu.h"
> +
> +#include <libfdt.h>
> +
> +#define TYPE_MIPS_BOSTON "mips-boston"
> +#define BOSTON(obj) OBJECT_CHECK(BostonState, (obj), TYPE_MIPS_BOSTON)
> +
> +typedef struct {
> +    SysBusDevice parent_obj;
> +
> +    MachineState *mach;
> +    MIPSCPSState *cps;
> +    SerialState *uart;
> +
> +    CharDriverState *lcd_display;
> +    char lcd_content[8];
> +
> +    hwaddr kernel_entry;
> +    hwaddr fdt_base;
> +} BostonState;
> +
> +enum boston_plat_reg {
> +    PLAT_FPGA_BUILD     = 0x00,
> +    PLAT_CORE_CL        = 0x04,
> +    PLAT_WRAPPER_CL     = 0x08,
> +    PLAT_SYSCLK_STATUS  = 0x0c,
> +    PLAT_SOFTRST_CTL    = 0x10,
> +#define PLAT_SOFTRST_CTL_SYSRESET       (1 << 4)
> +    PLAT_DDR3_STATUS    = 0x14,
> +#define PLAT_DDR3_STATUS_LOCKED         (1 << 0)
> +#define PLAT_DDR3_STATUS_CALIBRATED     (1 << 2)
> +    PLAT_PCIE_STATUS    = 0x18,
> +#define PLAT_PCIE_STATUS_PCIE0_LOCKED   (1 << 0)
> +#define PLAT_PCIE_STATUS_PCIE1_LOCKED   (1 << 8)
> +#define PLAT_PCIE_STATUS_PCIE2_LOCKED   (1 << 16)
> +    PLAT_FLASH_CTL      = 0x1c,
> +    PLAT_SPARE0         = 0x20,
> +    PLAT_SPARE1         = 0x24,
> +    PLAT_SPARE2         = 0x28,
> +    PLAT_SPARE3         = 0x2c,
> +    PLAT_MMCM_DIV       = 0x30,
> +#define PLAT_MMCM_DIV_CLK0DIV_SHIFT     0
> +#define PLAT_MMCM_DIV_INPUT_SHIFT       8
> +#define PLAT_MMCM_DIV_MUL_SHIFT         16
> +#define PLAT_MMCM_DIV_CLK1DIV_SHIFT     24
> +    PLAT_BUILD_CFG      = 0x34,
> +#define PLAT_BUILD_CFG_IOCU_EN          (1 << 0)
> +#define PLAT_BUILD_CFG_PCIE0_EN         (1 << 1)
> +#define PLAT_BUILD_CFG_PCIE1_EN         (1 << 2)
> +#define PLAT_BUILD_CFG_PCIE2_EN         (1 << 3)
> +    PLAT_DDR_CFG        = 0x38,
> +#define PLAT_DDR_CFG_SIZE               (0xf << 0)
> +#define PLAT_DDR_CFG_MHZ                (0xfff << 4)
> +    PLAT_NOC_PCIE0_ADDR = 0x3c,
> +    PLAT_NOC_PCIE1_ADDR = 0x40,
> +    PLAT_NOC_PCIE2_ADDR = 0x44,
> +    PLAT_SYS_CTL        = 0x48,
> +};
> +
> +static void boston_lcd_init(CharDriverState *chr)
> +{
> +    qemu_chr_fe_printf(chr, "        ");
> +}
> +
> +static uint64_t boston_lcd_read(void *opaque, hwaddr addr,
> +                                unsigned size)
> +{
> +    BostonState *s = opaque;
> +    uint64_t val = 0;
> +
> +    switch (size) {
> +    case 8:
> +        val |= (uint64_t)s->lcd_content[(addr + 7) & 0x7] << 56;
> +        val |= (uint64_t)s->lcd_content[(addr + 6) & 0x7] << 48;
> +        val |= (uint64_t)s->lcd_content[(addr + 5) & 0x7] << 40;
> +        val |= (uint64_t)s->lcd_content[(addr + 4) & 0x7] << 32;

/* fall through */ for each cases

> +    case 4:
> +        val |= (uint64_t)s->lcd_content[(addr + 3) & 0x7] << 24;
> +        val |= (uint64_t)s->lcd_content[(addr + 2) & 0x7] << 16;
> +    case 2:
> +        val |= (uint64_t)s->lcd_content[(addr + 1) & 0x7] << 8;
> +    case 1:
> +        val |= (uint64_t)s->lcd_content[(addr + 0) & 0x7];
> +        break;
> +    }
> +
> +    return val;
> +}
> +
> +static void boston_lcd_write(void *opaque, hwaddr addr,
> +                             uint64_t val, unsigned size)
> +{
> +    BostonState *s = opaque;
> +
> +    switch (size) {
> +    case 8:
> +        s->lcd_content[(addr + 7) & 0x7] = val >> 56;
> +        s->lcd_content[(addr + 6) & 0x7] = val >> 48;
> +        s->lcd_content[(addr + 5) & 0x7] = val >> 40;
> +        s->lcd_content[(addr + 4) & 0x7] = val >> 32;
> +    case 4:
> +        s->lcd_content[(addr + 3) & 0x7] = val >> 24;
> +        s->lcd_content[(addr + 2) & 0x7] = val >> 16;
> +    case 2:
> +        s->lcd_content[(addr + 1) & 0x7] = val >> 8;
> +    case 1:
> +        s->lcd_content[(addr + 0) & 0x7] = val;
> +        break;
> +    }
> +
> +    qemu_chr_fe_printf(s->lcd_display,
> +                       "\r%-8.8s", s->lcd_content);
> +}
> +
> +static const MemoryRegionOps boston_lcd_ops = {
> +    .read = boston_lcd_read,
> +    .write = boston_lcd_write,
> +    .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static uint64_t boston_platreg_read(void *opaque, hwaddr addr,
> +                                    unsigned size)
> +{
> +    BostonState *s = opaque;
> +    uint32_t gic_freq, val;
> +
> +    if (size != 4) {
> +        qemu_log_mask(LOG_UNIMP, "%uB platform register read", size);
> +        return 0;
> +    }
> +
> +    switch (addr & 0xffff) {
> +    case PLAT_FPGA_BUILD:
> +    case PLAT_CORE_CL:
> +    case PLAT_WRAPPER_CL:
> +        return 0;
> +    case PLAT_DDR3_STATUS:
> +        return PLAT_DDR3_STATUS_LOCKED | PLAT_DDR3_STATUS_CALIBRATED;
> +    case PLAT_MMCM_DIV:
> +        gic_freq = mips_gictimer_get_freq(s->cps->gic.gic_timer) / 1000000;

magic number

> +        val = gic_freq << PLAT_MMCM_DIV_INPUT_SHIFT;
> +        val |= 1 << PLAT_MMCM_DIV_MUL_SHIFT;
> +        val |= 1 << PLAT_MMCM_DIV_CLK0DIV_SHIFT;
> +        val |= 1 << PLAT_MMCM_DIV_CLK1DIV_SHIFT;
> +        return val;
> +    case PLAT_BUILD_CFG:
> +        val = PLAT_BUILD_CFG_PCIE0_EN;
> +        val |= PLAT_BUILD_CFG_PCIE1_EN;
> +        val |= PLAT_BUILD_CFG_PCIE2_EN;
> +        return val;
> +    case PLAT_DDR_CFG:
> +        val = s->mach->ram_size / G_BYTE;
> +        assert(!(val & ~PLAT_DDR_CFG_SIZE));
> +        val |= PLAT_DDR_CFG_MHZ;
> +        return val;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "Read platform register 0x%" HWADDR_PRIx,
> +                      addr & 0xffff);
> +        return 0;
> +    }
> +}
> +
> +static void boston_platreg_write(void *opaque, hwaddr addr,
> +                                 uint64_t val, unsigned size)
> +{
> +    if (size != 4) {
> +        qemu_log_mask(LOG_UNIMP, "%uB platform register write", size);
> +        return;
> +    }
> +
> +    switch (addr & 0xffff) {
> +    case PLAT_FPGA_BUILD:
> +    case PLAT_CORE_CL:
> +    case PLAT_WRAPPER_CL:
> +    case PLAT_DDR3_STATUS:
> +    case PLAT_PCIE_STATUS:
> +    case PLAT_MMCM_DIV:
> +    case PLAT_BUILD_CFG:
> +    case PLAT_DDR_CFG:
> +        /* read only */
> +        break;
> +    case PLAT_SOFTRST_CTL:
> +        if (val & PLAT_SOFTRST_CTL_SYSRESET) {
> +            qemu_system_reset_request();
> +        }
> +        break;
> +    default:
> +        qemu_log_mask(LOG_UNIMP, "Write platform register 0x%" HWADDR_PRIx
> +                      " = 0x%" PRIx64, addr & 0xffff, val);
> +        break;
> +    }
> +}
> +
> +static const MemoryRegionOps boston_platreg_ops = {
> +    .read = boston_platreg_read,
> +    .write = boston_platreg_write,
> +    .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static void boston_flash_write(void *opaque, hwaddr addr,
> +                               uint64_t val, unsigned size)
> +{
> +}
> +
> +static const MemoryRegionOps boston_flash_ops = {
> +    .write = boston_flash_write,
> +    .endianness = DEVICE_NATIVE_ENDIAN,
> +};
> +
> +static const TypeInfo boston_device = {
> +    .name          = TYPE_MIPS_BOSTON,
> +    .parent        = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(BostonState),
> +};
> +
> +static void boston_register_types(void)
> +{
> +    type_register_static(&boston_device);
> +}
> +type_init(boston_register_types)
> +
> +static void gen_firmware(uint32_t *p, hwaddr kernel_entry, hwaddr fdt_addr,
> +                         bool is_64b)
> +{
> +    const uint32_t cm_base = 0x16100000;
> +    const uint32_t gic_base = 0x16120000;
> +    const uint32_t cpc_base = 0x16200000;
> +
> +    /* Move CM GCRs */
> +    if (is_64b) {
> +        stl_p(p++, 0x40287803);                 /* dmfc0 $8, CMGCRBase */
> +        stl_p(p++, 0x00084138);                 /* dsll $8, $8, 4 */
> +    } else {
> +        stl_p(p++, 0x40087803);                 /* mfc0 $8, CMGCRBase */
> +        stl_p(p++, 0x00084100);                 /* sll  $8, $8, 4 */
> +    }
> +    stl_p(p++, 0x3c09a000);                     /* lui  $9, 0xa000 */
> +    stl_p(p++, 0x01094025);                     /* or   $8, $9 */
> +    stl_p(p++, 0x3c0a0000 | (cm_base >> 16));   /* lui  $10, cm_base >> 16 */
> +    if (is_64b) {
> +        stl_p(p++, 0xfd0a0008);                 /* sd   $10, 0x8($8) */
> +    } else {
> +        stl_p(p++, 0xad0a0008);                 /* sw   $10, 0x8($8) */
> +    }
> +    stl_p(p++, 0x012a4025);                     /* or   $8, $10 */
> +
> +    /* Move & enable GIC GCRs */
> +    stl_p(p++, 0x3c090000 | (gic_base >> 16));  /* lui  $9, gic_base >> 16 */
> +    stl_p(p++, 0x35290001);                     /* ori  $9, 0x1 */
> +    if (is_64b) {
> +        stl_p(p++, 0xfd090080);                 /* sd   $9, 0x80($8) */
> +    } else {
> +        stl_p(p++, 0xad090080);                 /* sw   $9, 0x80($8) */
> +    }
> +
> +    /* Move & enable CPC GCRs */
> +    stl_p(p++, 0x3c090000 | (cpc_base >> 16));  /* lui  $9, cpc_base >> 16 */
> +    stl_p(p++, 0x35290001);                     /* ori  $9, 0x1 */
> +    if (is_64b) {
> +        stl_p(p++, 0xfd090088);                 /* sd   $9, 0x88($8) */
> +    } else {
> +        stl_p(p++, 0xad090088);                 /* sw   $9, 0x88($8) */
> +    }
> +
> +    /*
> +     * Setup argument registers to follow the UHI boot protocol:
> +     *
> +     * a0/$4 = -2
> +     * a1/$5 = virtual address of FDT
> +     * a2/$6 = 0
> +     * a3/$7 = 0
> +     */
> +    stl_p(p++, 0x2404fffe);                     /* li   $4, -2 */
> +                                                /* lui  $5, hi(fdt_addr) */
> +    stl_p(p++, 0x3c050000 | ((fdt_addr >> 16) & 0xffff));
> +    if (fdt_addr & 0xffff) {                    /* ori  $5, lo(fdt_addr) */
> +        stl_p(p++, 0x34a50000 | (fdt_addr & 0xffff));
> +    }
> +    stl_p(p++, 0x34060000);                     /* li   $6, 0 */
> +    stl_p(p++, 0x34070000);                     /* li   $7, 0 */
> +
> +    /* Load kernel entry address & jump to it */
> +                                                /* lui  $25, hi(kernel_entry) */
> +    stl_p(p++, 0x3c190000 | ((kernel_entry >> 16) & 0xffff));
> +                                                /* ori  $25, lo(kernel_entry) */
> +    stl_p(p++, 0x37390000 | (kernel_entry & 0xffff));
> +    stl_p(p++, 0x03200009);                     /* jr   $25 */
> +}
> +
> +static const void *boston_fdt_filter(void *opaque, const void *fdt_orig,
> +                                     const void *match_data, hwaddr *load_addr)
> +{
> +    BostonState *s = BOSTON(opaque);
> +    MachineState *machine = s->mach;
> +    const char *cmdline;
> +    int err;
> +    void *fdt;
> +    size_t fdt_sz, ram_low_sz, ram_high_sz;
> +
> +    fdt_sz = fdt_totalsize(fdt_orig) * 2;
> +    fdt = g_malloc0(fdt_sz);
> +
> +    err = fdt_open_into(fdt_orig, fdt, fdt_sz);
> +    if (err) {
> +        fprintf(stderr, "unable to open FDT\n");
> +        return NULL;
> +    }
> +
> +    cmdline = (machine->kernel_cmdline && machine->kernel_cmdline[0])
> +            ? machine->kernel_cmdline : " ";
> +    err = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);
> +    if (err < 0) {
> +        fprintf(stderr, "couldn't set /chosen/bootargs\n");
> +        return NULL;
> +    }
> +
> +    ram_low_sz = MIN(256 * M_BYTE, machine->ram_size);
> +    ram_high_sz = machine->ram_size - ram_low_sz;
> +    qemu_fdt_setprop_sized_cells(fdt, "/memory@0", "reg",
> +                                 1, 0x00000000, 1, ram_low_sz,
> +                                 1, 0x90000000, 1, ram_high_sz);
> +
> +    fdt = g_realloc(fdt, fdt_totalsize(fdt));
> +    qemu_fdt_dumpdtb(fdt, fdt_sz);
> +
> +    s->fdt_base = *load_addr;
> +
> +    return fdt;
> +}
> +
> +static const void *boston_kernel_filter(void *opaque, const void *kernel,
> +                                        hwaddr *load_addr, hwaddr *entry_addr)
> +{
> +    BostonState *s = BOSTON(opaque);
> +
> +    s->kernel_entry = *entry_addr;
> +
> +    return kernel;
> +}
> +
> +static const struct fit_loader_match boston_matches[] = {
> +    { "img,boston" },
> +    { NULL },
> +};
> +
> +static const struct fit_loader boston_fit_loader = {
> +    .matches = boston_matches,
> +    .addr_to_phys = cpu_mips_kseg0_to_phys,
> +    .fdt_filter = boston_fdt_filter,
> +    .kernel_filter = boston_kernel_filter,
> +};
> +
> +static void boston_mach_init(MachineState *machine)
> +{
> +    DeviceState *dev;
> +    BostonState *s;
> +    Error *err = NULL;
> +    const char *cpu_model;
> +    MemoryRegion *flash, *ddr, *ddr_low_alias, *lcd, *platreg;
> +    MemoryRegion *sys_mem = get_system_memory();
> +    XilinxPCIEHost *pcie2;
> +    PCIDevice *ahci;
> +    DriveInfo *hd[6];
> +    int fw_size, fit_err;
> +    bool is_64b;
> +
> +    if (machine->ram_size % G_BYTE) {

I've tested with differnt ram size options but only 1GB and 2GB worked
fine. Perhaps it is better to restrict it up to 2GB for now?

> +        error_report("Memory size must be a multiple of 1GB");
> +        exit(1);
> +    }
> +
> +    cpu_model = machine->cpu_model ?: "I6400";
> +
> +    dev = qdev_create(NULL, TYPE_MIPS_BOSTON);
> +    qdev_init_nofail(dev);
> +
> +    s = BOSTON(dev);
> +    s->mach = machine;
> +    s->cps = g_new0(MIPSCPSState, 1);
> +
> +    if (!cpu_supports_cps_smp(cpu_model)) {
> +        error_report("Boston requires CPUs which support CPS");
> +        exit(1);
> +    }
> +
> +    is_64b = cpu_supports_isa(cpu_model, ISA_MIPS64);
> +
> +    object_initialize(s->cps, sizeof(MIPSCPSState), TYPE_MIPS_CPS);
> +    qdev_set_parent_bus(DEVICE(s->cps), sysbus_get_default());
> +
> +    object_property_set_str(OBJECT(s->cps), cpu_model, "cpu-model", &err);
> +    object_property_set_int(OBJECT(s->cps), smp_cpus, "num-vp", &err);
> +    object_property_set_bool(OBJECT(s->cps), true, "realized", &err);
> +
> +    if (err != NULL) {
> +        error_report("%s", error_get_pretty(err));
> +        exit(1);
> +    }
> +
> +    sysbus_mmio_map_overlap(SYS_BUS_DEVICE(s->cps), 0, 0, 1);
> +
> +    flash =  g_new(MemoryRegion, 1);
> +    memory_region_init_rom_device(flash, NULL, &boston_flash_ops, s,
> +                                  "boston.flash", 128 * M_BYTE, &err);
> +    memory_region_add_subregion_overlap(sys_mem, 0x18000000, flash, 0);
> +
> +    ddr = g_new(MemoryRegion, 1);
> +    memory_region_allocate_system_memory(ddr, NULL, "boston.ddr",
> +                                         machine->ram_size);
> +    memory_region_add_subregion_overlap(sys_mem, 0x80000000, ddr, 0);
> +
> +    ddr_low_alias = g_new(MemoryRegion, 1);
> +    memory_region_init_alias(ddr_low_alias, NULL, "boston_low.ddr",
> +                             ddr, 0, MIN(machine->ram_size, (256 * M_BYTE)));
> +    memory_region_add_subregion_overlap(sys_mem, 0, ddr_low_alias, 0);
> +
> +    xilinx_pcie_init(sys_mem, 0,
> +                     0x10000000, 32 * M_BYTE,
> +                     0x40000000, 1 * G_BYTE,
> +                     get_cps_irq(s->cps, 2), false);
> +
> +    xilinx_pcie_init(sys_mem, 1,
> +                     0x12000000, 32 * M_BYTE,
> +                     0x20000000, 512 * M_BYTE,
> +                     get_cps_irq(s->cps, 1), false);
> +
> +    pcie2 = xilinx_pcie_init(sys_mem, 2,
> +                             0x14000000, 32 * M_BYTE,
> +                             0x16000000, 1 * M_BYTE,
> +                             get_cps_irq(s->cps, 0), true);
> +
> +    platreg = g_new(MemoryRegion, 1);
> +    memory_region_init_io(platreg, NULL, &boston_platreg_ops, s,
> +                          "boston-platregs", 0x1000);
> +    memory_region_add_subregion_overlap(sys_mem, 0x17ffd000, platreg, 0);
> +
> +    if (!serial_hds[0]) {
> +            serial_hds[0] = qemu_chr_new("serial0", "null", NULL);
> +    }
> +
> +    s->uart = serial_mm_init(sys_mem, 0x17ffe000, 2,
> +                             get_cps_irq(s->cps, 3), 10000000,
> +                             serial_hds[0], DEVICE_NATIVE_ENDIAN);
> +
> +    lcd = g_new(MemoryRegion, 1);
> +    memory_region_init_io(lcd, NULL, &boston_lcd_ops, s, "boston-lcd", 0x8);
> +    memory_region_add_subregion_overlap(sys_mem, 0x17fff000, lcd, 0);
> +    s->lcd_display = qemu_chr_new("lcd", "vc:320x240", boston_lcd_init);
> +
> +    ahci = pci_create_simple_multifunction(&PCI_BRIDGE(&pcie2->root)->sec_bus,
> +                                           PCI_DEVFN(0, 0),
> +                                           true, TYPE_ICH9_AHCI);
> +    g_assert(ARRAY_SIZE(hd) == ICH_AHCI(ahci)->ahci.ports);
> +    ide_drive_get(hd, ICH_AHCI(ahci)->ahci.ports);
> +    ahci_ide_create_devs(ahci, hd);
> +
> +    if (machine->firmware) {
> +        fw_size = load_image_targphys(machine->firmware,
> +                                      0x1fc00000, 4 * M_BYTE);
> +        if (fw_size == -1) {
> +            error_printf("unable to load firmware image '%s'\n",
> +                          machine->firmware);
> +            exit(1);
> +        }
> +    } else if (machine->kernel_filename) {
> +        fit_err = load_fit(&boston_fit_loader, machine->kernel_filename, s);
> +        if (fit_err) {
> +            error_printf("unable to load FIT image\n");
> +            exit(1);
> +        }
> +
> +        gen_firmware(memory_region_get_ram_ptr(flash) + 0x7c00000,
> +                     s->kernel_entry, s->fdt_base, is_64b);
> +    } else {
> +        error_printf("Please provide either a -kernel or -bios argument\n");
> +        exit(1);
> +    }
> +}
> +
> +static void boston_mach_class_init(MachineClass *mc)
> +{
> +    mc->desc = "MIPS Boston";
> +    mc->init = boston_mach_init;
> +    mc->default_ram_size = 2 * G_BYTE;
> +    mc->max_cpus = 16;
> +}
> +DEFINE_MACHINE("boston", boston_mach_class_init)
> 

Sorry for delaying but in general looking good other than the bigendian
target and the ram size issues.

Reviewed-by: Yongbok Kim <yongbok.kim@imgtec.com>