write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 u-boot/cmd/mtd.c
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@@ -13,6 +13,10 @@
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 #include <mapmem.h>
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 #include <mtd.h>
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+#define DEV_NAME_MAX_LENGTH	0x40
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+static char g_devname[DEV_NAME_MAX_LENGTH];
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+static struct mtd_info *g_mtd;
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+
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 static uint mtd_len_to_pages(struct mtd_info *mtd, u64 len)
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 {
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 	do_div(len, mtd->writesize);
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@@ -244,14 +248,20 @@
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 		return CMD_RET_USAGE;
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 	mtd_name = argv[2];
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-	mtd_probe_devices();
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-	mtd = get_mtd_device_nm(mtd_name);
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-	if (IS_ERR_OR_NULL(mtd)) {
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-		printf("MTD device %s not found, ret %ld\n",
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-		       mtd_name, PTR_ERR(mtd));
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-		return CMD_RET_FAILURE;
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+	if (!strncmp(mtd_name, g_devname, strlen(mtd_name)) && g_mtd) {
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+		mtd = g_mtd;
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+	} else {
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+		mtd_probe_devices();
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+		mtd = get_mtd_device_nm(mtd_name);
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+		if (IS_ERR_OR_NULL(mtd)) {
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+			printf("MTD device %s not found, ret %ld\n",
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+			       mtd_name, PTR_ERR(mtd));
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+			return CMD_RET_FAILURE;
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+		}
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+		put_mtd_device(mtd);
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+		g_mtd = mtd;
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+		strncpy(g_devname, mtd_name, strlen(mtd_name));
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 	}
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-	put_mtd_device(mtd);
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 	argc -= 3;
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 	argv += 3;