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Panologic: Added SPI flash support. Successfully boots Linux from flash. #410

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merged 3 commits into from
Apr 23, 2020
Merged

Panologic: Added SPI flash support. Successfully boots Linux from flash. #410

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e9ae488
Added SPI flash support. Successfully boots Linux from flash.
skiphansen Apr 18, 2020
3562dc5
Merge branch 'master' into spi_support
skiphansen Apr 23, 2020
92018c4
Replaced add_wb_slave/add_memory_region with register_mem per review …
skiphansen Apr 23, 2020
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19 changes: 19 additions & 0 deletions platforms/pano_logic_g2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,14 @@
# NET "DDR2B_ODT" LOC = J6 | IOSTANDARD = LVCMOS18;
Subsignal("odt", Pins("J6"), IOStandard("SSTL18_II")),
),
## onBoard SPI Flash
("spiflash", 0,
Subsignal("cs_n", Pins("T5"), IOStandard("LVCMOS33")),
Subsignal("clk", Pins("Y21"), IOStandard("LVCMOS33")),
Subsignal("mosi", Pins("AB20"), IOStandard("LVCMOS33")),
Subsignal("miso", Pins("AA20"), IOStandard("LVCMOS33"))
),

]

_hdmi_serial = (
Expand All @@ -181,6 +189,17 @@ class Platform(XilinxPlatform):
default_clk_name = "clk125"
default_clk_period = 1e9/125e6

# actual .bit file size rounded up to next flash erase boundary
gateware_size = 0x420000

# Micron M25P128
spiflash_model = "m25p128"
spiflash_read_dummy_bits = 8
spiflash_clock_div = 4
spiflash_total_size = int((128/8)*1024*1024) # 128Mbit/16Mbyte
spiflash_page_size = 256
spiflash_sector_size = 0x20000

def __init__(self, programmer="impact", device="xc6slx150", uart_connection="dvi"):
if uart_connection == 'dvi':
_io.append(_dvi_serial)
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21 changes: 20 additions & 1 deletion targets/pano_logic_g2/base.py
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Expand Up @@ -72,7 +72,26 @@ def __init__(self, platform, **kwargs):
interface=self.cpu.debug_bus,
size=0x100)

# ??????
# Memory mapped SPI Flash ------------------------------------------------------------------
self.submodules.spiflash = spi_flash.SpiFlash(
platform.request("spiflash"),
dummy=platform.spiflash_read_dummy_bits,
div=platform.spiflash_clock_div,
endianness=self.cpu.endianness)
self.add_csr("spiflash")
self.add_constant("SPIFLASH_PAGE_SIZE", platform.spiflash_page_size)
self.add_constant("SPIFLASH_SECTOR_SIZE", platform.spiflash_sector_size)
self.add_constant("SPIFLASH_TOTAL_SIZE", platform.spiflash_total_size)
self.register_mem("spiflash", self.mem_map["spiflash"],
self.spiflash.bus, size=platform.spiflash_total_size)
self.flash_boot_address = self.mem_map["spiflash"]+platform.gateware_size
self.add_constant("FLASH_BOOT_ADDRESS", self.flash_boot_address)
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self.add_constant("DEVICE_TREE_IMAGE_FLASH_OFFSET",0x00000000)
self.add_constant("EMULATOR_IMAGE_FLASH_OFFSET",0x20000)
self.add_constant("KERNEL_IMAGE_FLASH_OFFSET",0x40000)
self.add_constant("ROOTFS_IMAGE_FLASH_OFFSET",0x5c0000)

# Take Ethernet Phy out of reset for SYSCLK of 125 Mhz
gmii_rst_n = platform.request("gmii_rst_n")
self.comb += [
gmii_rst_n.eq(1)
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