diff --git a/lib/libsecureboot/vectx.c b/lib/libsecureboot/vectx.c
index 433df00f244c..3e5277d935f0 100644
--- a/lib/libsecureboot/vectx.c
+++ b/lib/libsecureboot/vectx.c
@@ -211,6 +211,7 @@ ssize_t
 vectx_read(struct vectx *ctx, void *buf, size_t nbytes)
 {
 	unsigned char *bp = buf;
+	int d;
 	int n;
 	int delta;
 	int x;
@@ -221,23 +222,30 @@ vectx_read(struct vectx *ctx, void *buf, size_t nbytes)
 
 	off = 0;
 	do {
-		n = read(ctx->vec_fd, &bp[off], nbytes - off);
-		if (n < 0)
+		/*
+		 * Do this in reasonable chunks so
+		 * we don't timeout if doing tftp
+		 */
+		x = nbytes - off;
+		x = MIN(PAGE_SIZE, x);
+		d = n = read(ctx->vec_fd, &bp[off], x);
+		if (n < 0) {
 			return (n);
-		if (n > 0) {
+		}
+		if (d > 0) {
 			/* we may have seeked backwards! */
 			delta = ctx->vec_hashed - ctx->vec_off;
 			if (delta > 0) {
-				x = MIN(delta, n);
+				x = MIN(delta, d);
 				off += x;
-				n -= x;
+				d -= x;
 				ctx->vec_off += x;
 			}
-			if (n > 0) {
-				ctx->vec_md->update(&ctx->vec_ctx.vtable, &bp[off], n);
-				off += n;
-				ctx->vec_off += n;
-				ctx->vec_hashed += n;
+			if (d > 0) {
+				ctx->vec_md->update(&ctx->vec_ctx.vtable, &bp[off], d);
+				off += d;
+				ctx->vec_off += d;
+				ctx->vec_hashed += d;
 			}
 		}
 	} while (n > 0 && off < nbytes);
diff --git a/stand/libsa/pkgfs.c b/stand/libsa/pkgfs.c
index df87a7035153..d4794963b2c1 100644
--- a/stand/libsa/pkgfs.c
+++ b/stand/libsa/pkgfs.c
@@ -60,7 +60,7 @@ struct fs_ops pkgfs_fsops = {
 };
 
 #define PKG_BUFSIZE	512
-#define	PKG_MAXCACHESZ	16384
+#define	PKG_MAXCACHESZ	(16384 * 3)
 
 #define	PKG_FILEEXT	".tgz"
 
@@ -132,6 +132,7 @@ struct package
 static struct package *package = NULL;
 
 static int new_package(int, struct package **);
+static int cache_data(struct tarfile *tf, int);
 
 void
 pkgfs_cleanup(void)
@@ -282,6 +283,9 @@ pkg_read(struct open_file *f, void *buf, size_t size, size_t *res)
 		return (EBADF);
 	}
 
+	if (tf->tf_cachesz == 0)
+		cache_data(tf, 1);
+
 	fp = tf->tf_fp;
 	p = buf;
 	sz = 0;
@@ -311,16 +315,6 @@ pkg_read(struct open_file *f, void *buf, size_t size, size_t *res)
 		fp += sz;
 		p += sz;
 		size -= sz;
-
-		if (tf->tf_cachesz != 0)
-			continue;
-
-		tf->tf_cachesz = (sz <= PKG_MAXCACHESZ) ? sz : PKG_MAXCACHESZ;
-		tf->tf_cache = malloc(tf->tf_cachesz);
-		if (tf->tf_cache != NULL)
-			memcpy(tf->tf_cache, buf, tf->tf_cachesz);
-		else
-			tf->tf_cachesz = 0;
 	}
 
 	tf->tf_fp = fp;
@@ -484,8 +478,20 @@ get_zipped(struct package *pkg, void *buf, size_t bufsz)
 	return (0);
 }
 
+/**
+ * @brief
+ * cache data of a tarfile
+ *
+ * @param[in] tf
+ *	tarfile pointer
+ *
+ * @param[in] force
+ *	If file size > PKG_MAXCACHESZ, cache that much
+ *
+ * @return 0, -1 (errno set to error value)
+ */
 static int
-cache_data(struct tarfile *tf)
+cache_data(struct tarfile *tf, int force)
 {
 	struct package *pkg;
 	size_t sz;
@@ -503,21 +509,28 @@ cache_data(struct tarfile *tf)
 		return (-1);
 	}
 
+	if (tf->tf_cachesz > 0) {
+		DBG(("%s: data already cached\n", __func__));
+		errno = EINVAL;
+		return (-1);
+	}
+
 	if (tf->tf_ofs != pkg->pkg_ofs) {
-		DBG(("%s: caching after partial read of file %s?\n",
+		DBG(("%s: caching after force read of file %s?\n",
 		    __func__, tf->tf_hdr.ut_name));
 		errno = EINVAL;
 		return (-1);
 	}
 
 	/* We don't cache everything... */
-	if (tf->tf_size > PKG_MAXCACHESZ) {
-		errno = ENOMEM;
+	if (tf->tf_size > PKG_MAXCACHESZ && !force)  {
+		errno = ENOBUFS;
 		return (-1);
 	}
 
+	sz = tf->tf_size < PKG_MAXCACHESZ ? tf->tf_size : PKG_MAXCACHESZ;
 	/* All files are padded to a multiple of 512 bytes. */
-	sz = (tf->tf_size + 0x1ff) & ~0x1ff;
+	sz = (sz + 0x1ff) & ~0x1ff;
 
 	tf->tf_cache = malloc(sz);
 	if (tf->tf_cache == NULL) {
@@ -741,7 +754,7 @@ scan_tarfile(struct package *pkg, struct tarfile *last)
 
 		if (ofs != pkg->pkg_ofs) {
 			if (last != NULL && pkg->pkg_ofs == last->tf_ofs) {
-				if (cache_data(last) == -1)
+				if (cache_data(last, 0) == -1)
 					return (NULL);
 			} else {
 				sz = ofs - pkg->pkg_ofs;
diff --git a/stand/libsa/tftp.c b/stand/libsa/tftp.c
index 5d5a3000b2af..3892f2aad86a 100644
--- a/stand/libsa/tftp.c
+++ b/stand/libsa/tftp.c
@@ -100,11 +100,13 @@ static int	is_open = 0;
  * Jumbo frames in the future.
  */
 #define	TFTP_MAX_BLKSIZE 9008
+#define TFTP_TRIES 2
 
 struct tftp_handle {
 	struct iodesc  *iodesc;
 	int		currblock;	/* contents of lastdata */
-	int		islastblock;	/* flag */
+	int		islastblock:1;	/* flag */
+	int		tries:4;	/* number of read attempts */
 	int		validsize;
 	int		off;
 	char		*path;	/* saved for re-requests */
@@ -530,7 +532,12 @@ tftp_read(struct open_file *f, void *addr, size_t size,
 #ifdef TFTP_DEBUG
 				printf("tftp: read error\n");
 #endif
-				return (rc);
+				if (tftpfile->tries > TFTP_TRIES) {
+					return (rc);
+				} else {
+					tftpfile->tries++;
+					tftp_makereq(tftpfile);
+				}
 			}
 			if (tftpfile->islastblock)
 				break;