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| author | Scott Wood <scottwood@freescale.com> | 2009-06-24 17:23:49 -0500 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2009-07-07 17:58:10 -0500 |
| commit | 1dac3a51875967f32641bbc0d26dc382ef02330a (patch) | |
| tree | da3189b90533d3a383021a92a91352141e138d36 /nand_spl/nand_boot.c | |
| parent | 98713d2663d5d30dde74f48f547114a2bfd9d463 (diff) | |
| download | u-boot-imx-1dac3a51875967f32641bbc0d26dc382ef02330a.zip u-boot-imx-1dac3a51875967f32641bbc0d26dc382ef02330a.tar.gz u-boot-imx-1dac3a51875967f32641bbc0d26dc382ef02330a.tar.bz2 | |
nand_spl: Fix cmd_ctrl usage in nand_boot.c.
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 <scottwood@freescale.com>
Diffstat (limited to 'nand_spl/nand_boot.c')
| -rw-r--r-- | 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, |