Date: Tue, 13 May 2014 12:12:19 +0300 From: "Sulev-Madis Silber (ketas)" <madis555@hot.ee> To: freebsd-arm <freebsd-arm@FreeBSD.org> Subject: Patch to make BBB properly boot from eMMC every time Message-ID: <5371E1F3.6080002@hot.ee>
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On my BBB, I need following patch to boot from eMMC 100% of cases.
Without that, device is detected with 1 / 4 bit bus (it's actually 8
bit) or not at all (then boot fails).
Actually, that code looks like weird way to implement sleep(), or at
least it has such (side) effect.
Actually ian@ made that patch, and was confused about results.
-------------------------------------------------------------------------
Index: sys/dev/mmc/mmc.c
===================================================================
--- sys/dev/mmc/mmc.c (revision 264141)
+++ sys/dev/mmc/mmc.c (working copy)
@@ -769,8 +769,10 @@ mmc_test_bus_width(struct mmc_softc *sc)
data.data = p8;
data.len = 8;
data.flags = MMC_DATA_WRITE;
- mmc_wait_for_cmd(sc, &cmd, 0);
-
+ err = mmc_wait_for_cmd(sc, &cmd, 0);
+ if (err != 0)
+ device_printf(sc->dev, "BUSTEST_W err %d\n", err);
+
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
cmd.opcode = MMC_BUSTEST_R;
@@ -782,7 +784,12 @@ mmc_test_bus_width(struct mmc_softc *sc)
data.len = 8;
data.flags = MMC_DATA_READ;
err = mmc_wait_for_cmd(sc, &cmd, 0);
-
+ if (err != 0)
+ device_printf(sc->dev, "BUSTEST_R err %d\n", err);
+
+ device_printf(sc->dev, "read %02x %02x %02x %02x %02x
%02x %02x %02x\n",
+ buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
buf[6], buf[7]);
+
mmcbr_set_bus_width(sc->dev, bus_width_1);
mmcbr_update_ios(sc->dev);
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