When adding large page NAND support to this file, I had a misunderstanding about the exact semantics of NAND_CTRL_CHANGE (which isn't documented anywhere I can find) -- it is apparently just a hint to drivers, which aren't required to preserve the old value for subsequent non-"change" invocations.
This change makes nand_boot.c no longer assume this. Note that this happened to work by chance with some NAND drivers, which don't preserve the value, but treat 0 equivalently to NAND_CTRL_ALE. I don't have hardware to test this, so any testing is appreciated. Signed-off-by: Scott Wood <scottw...@freescale.com> --- Applied to u-boot-nand-flash. nand_spl/nand_boot.c | 18 +++++++++++------- 1 files changed, 11 insertions(+), 7 deletions(-) diff --git a/nand_spl/nand_boot.c b/nand_spl/nand_boot.c index be2e69c..b9fd6f5 100644 --- a/nand_spl/nand_boot.c +++ b/nand_spl/nand_boot.c @@ -47,11 +47,13 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 /* Set ALE and clear CLE to start address cycle */ /* Column address */ this->cmd_ctrl(mtd, offs, NAND_CTRL_ALE | NAND_CTRL_CHANGE); - this->cmd_ctrl(mtd, page_addr & 0xff, 0); /* A[16:9] */ - this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff, 0); /* A[24:17] */ + this->cmd_ctrl(mtd, page_addr & 0xff, NAND_CTRL_ALE); /* A[16:9] */ + this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff, + NAND_CTRL_ALE); /* A[24:17] */ #ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE /* One more address cycle for devices > 32MiB */ - this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, 0); /* A[28:25] */ + this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, + NAND_CTRL_ALE); /* A[28:25] */ #endif /* Latch in address */ this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE); @@ -94,13 +96,15 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8 /* Column address */ this->cmd_ctrl(mtd, offs & 0xff, NAND_CTRL_ALE | NAND_CTRL_CHANGE); /* A[7:0] */ - this->cmd_ctrl(mtd, (offs >> 8) & 0xff, 0); /* A[11:9] */ + this->cmd_ctrl(mtd, (offs >> 8) & 0xff, NAND_CTRL_ALE); /* A[11:9] */ /* Row address */ - this->cmd_ctrl(mtd, (page_addr & 0xff), 0); /* A[19:12] */ - this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff), 0); /* A[27:20] */ + this->cmd_ctrl(mtd, (page_addr & 0xff), NAND_CTRL_ALE); /* A[19:12] */ + this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff), + NAND_CTRL_ALE); /* A[27:20] */ #ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE /* One more address cycle for devices > 128MiB */ - this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, 0); /* A[31:28] */ + this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f, + NAND_CTRL_ALE); /* A[31:28] */ #endif /* Latch in address */ this->cmd_ctrl(mtd, NAND_CMD_READSTART, -- 1.5.6.rc1.6.gc53ad _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot