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soc_sdram: add l2_data_width parameter to set minimal l2_data_width to improve DRAM accesses efficiency.

This commit is contained in:
Florent Kermarrec 2020-01-13 13:00:17 +01:00
parent 23175190d8
commit 39ce39a298
1 changed files with 5 additions and 3 deletions
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8
litex/soc/integration/soc_sdram.py
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@ -26,12 +26,13 @@ class SoCSDRAM(SoCCore):
} }
csr_map.update(SoCCore.csr_map) csr_map.update(SoCCore.csr_map)
def __init__(self, platform, clk_freq, l2_size=8192, **kwargs): def __init__(self, platform, clk_freq, l2_size=8192, l2_data_width=128, **kwargs):
SoCCore.__init__(self, platform, clk_freq, **kwargs) SoCCore.__init__(self, platform, clk_freq, **kwargs)
if not self.integrated_main_ram_size: if not self.integrated_main_ram_size:
if self.cpu_type is not None and self.csr_data_width > 32: if self.cpu_type is not None and self.csr_data_width > 32:
raise NotImplementedError("BIOS supports SDRAM initialization only for csr_data_width<=32") raise NotImplementedError("BIOS supports SDRAM initialization only for csr_data_width<=32")
self.l2_size = l2_size self.l2_size = l2_size
self.l2_data_width = l2_data_width
self._sdram_phy = [] self._sdram_phy = []
self._wb_sdram_ifs = [] self._wb_sdram_ifs = []
@ -99,7 +100,8 @@ class SoCSDRAM(SoCCore):
self.register_mem("main_ram", self.mem_map["main_ram"], wb_sdram, main_ram_size) self.register_mem("main_ram", self.mem_map["main_ram"], wb_sdram, main_ram_size)
# L2 Cache ----------------------------------------------------------------------------- # L2 Cache -----------------------------------------------------------------------------
l2_cache = wishbone.Cache(l2_size//4, self._wb_sdram, wishbone.Interface(port.data_width)) l2_data_width = max(port.data_width, self.l2_data_width)
l2_cache = wishbone.Cache(l2_size//4, self._wb_sdram, wishbone.Interface(l2_data_width))
# XXX Vivado ->2018.2 workaround, Vivado is not able to map correctly our L2 cache. # XXX Vivado ->2018.2 workaround, Vivado is not able to map correctly our L2 cache.
# Issue is reported to Xilinx, Remove this if ever fixed by Xilinx... # Issue is reported to Xilinx, Remove this if ever fixed by Xilinx...
from litex.build.xilinx.vivado import XilinxVivadoToolchain from litex.build.xilinx.vivado import XilinxVivadoToolchain