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Merge pull request #490 from daveshah1/rdimm_bside_init 

Add RDIMM side-B inversion support
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enjoy-digital 2020-05-11 09:42:55 +02:00 committed by GitHub
parent c9e36d7fdd 13db89ebd2
commit 80f5327e3d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 0 deletions
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14
litex/soc/software/bios/sdram.c
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@ -191,6 +191,13 @@ void sdrwlon(void)
sdram_dfii_pi0_address_write(DDRX_MR1 | (1 << 7)); sdram_dfii_pi0_address_write(DDRX_MR1 | (1 << 7));
sdram_dfii_pi0_baddress_write(1); sdram_dfii_pi0_baddress_write(1);
command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS);
#ifdef SDRAM_PHY_DDR4_RDIMM
sdram_dfii_pi0_address_write((DDRX_MR1 | (1 << 7)) ^ 0x2BF8) ;
sdram_dfii_pi0_baddress_write(1 ^ 0xF);
command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS);
#endif
ddrphy_wlevel_en_write(1); ddrphy_wlevel_en_write(1);
} }
@ -199,6 +206,13 @@ void sdrwloff(void)
sdram_dfii_pi0_address_write(DDRX_MR1); sdram_dfii_pi0_address_write(DDRX_MR1);
sdram_dfii_pi0_baddress_write(1); sdram_dfii_pi0_baddress_write(1);
command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS); command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS);
#ifdef SDRAM_PHY_DDR4_RDIMM
sdram_dfii_pi0_address_write(DDRX_MR1 ^ 0x2BF8);
sdram_dfii_pi0_baddress_write(1 ^ 0xF);
command_p0(DFII_COMMAND_RAS|DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS);
#endif
ddrphy_wlevel_en_write(0); ddrphy_wlevel_en_write(0);
} }